1 | // Boost io/ios_state.hpp header file --------------------------------------// |
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2 | |
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3 | // Copyright 2002, 2005 Daryle Walker. Use, modification, and distribution |
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4 | // are subject to the Boost Software License, Version 1.0. (See accompanying |
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5 | // file LICENSE_1_0.txt or a copy at <http://www.boost.org/LICENSE_1_0.txt>.) |
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6 | |
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7 | // See <http://www.boost.org/libs/io/> for the library's home page. |
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8 | |
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9 | #ifndef BOOST_IO_IOS_STATE_HPP |
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10 | #define BOOST_IO_IOS_STATE_HPP |
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11 | |
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12 | #include <boost/io_fwd.hpp> // self include |
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13 | #include <boost/detail/workaround.hpp> |
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14 | |
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15 | #include <ios> // for std::ios_base, std::basic_ios, etc. |
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16 | #ifndef BOOST_NO_STD_LOCALE |
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17 | #include <locale> // for std::locale |
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18 | #endif |
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19 | #include <ostream> // for std::basic_ostream |
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20 | #include <streambuf> // for std::basic_streambuf |
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21 | #include <string> // for std::char_traits |
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22 | |
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23 | |
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24 | namespace boost |
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25 | { |
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26 | namespace io |
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27 | { |
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28 | |
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29 | |
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30 | // Basic stream state saver class declarations -----------------------------// |
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31 | |
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32 | class ios_flags_saver |
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33 | { |
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34 | public: |
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35 | typedef ::std::ios_base state_type; |
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36 | typedef ::std::ios_base::fmtflags aspect_type; |
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37 | |
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38 | explicit ios_flags_saver( state_type &s ) |
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39 | : s_save_( s ), a_save_( s.flags() ) |
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40 | {} |
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41 | ios_flags_saver( state_type &s, aspect_type const &a ) |
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42 | : s_save_( s ), a_save_( s.flags(a) ) |
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43 | {} |
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44 | ~ios_flags_saver() |
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45 | { this->restore(); } |
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46 | |
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47 | void restore() |
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48 | { s_save_.flags( a_save_ ); } |
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49 | |
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50 | private: |
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51 | state_type & s_save_; |
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52 | aspect_type const a_save_; |
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53 | |
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54 | ios_flags_saver& operator=(const ios_flags_saver&); |
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55 | }; |
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56 | |
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57 | class ios_precision_saver |
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58 | { |
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59 | public: |
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60 | typedef ::std::ios_base state_type; |
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61 | typedef ::std::streamsize aspect_type; |
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62 | |
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63 | explicit ios_precision_saver( state_type &s ) |
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64 | : s_save_( s ), a_save_( s.precision() ) |
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65 | {} |
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66 | ios_precision_saver( state_type &s, aspect_type const &a ) |
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67 | : s_save_( s ), a_save_( s.precision(a) ) |
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68 | {} |
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69 | ~ios_precision_saver() |
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70 | { this->restore(); } |
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71 | |
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72 | void restore() |
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73 | { s_save_.precision( a_save_ ); } |
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74 | |
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75 | private: |
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76 | state_type & s_save_; |
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77 | aspect_type const a_save_; |
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78 | |
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79 | ios_precision_saver& operator=(const ios_precision_saver&); |
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80 | }; |
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81 | |
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82 | class ios_width_saver |
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83 | { |
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84 | public: |
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85 | typedef ::std::ios_base state_type; |
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86 | typedef ::std::streamsize aspect_type; |
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87 | |
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88 | explicit ios_width_saver( state_type &s ) |
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89 | : s_save_( s ), a_save_( s.width() ) |
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90 | {} |
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91 | ios_width_saver( state_type &s, aspect_type const &a ) |
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92 | : s_save_( s ), a_save_( s.width(a) ) |
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93 | {} |
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94 | ~ios_width_saver() |
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95 | { this->restore(); } |
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96 | |
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97 | void restore() |
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98 | { s_save_.width( a_save_ ); } |
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99 | |
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100 | private: |
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101 | state_type & s_save_; |
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102 | aspect_type const a_save_; |
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103 | ios_width_saver& operator=(const ios_width_saver&); |
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104 | }; |
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105 | |
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106 | |
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107 | // Advanced stream state saver class template declarations -----------------// |
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108 | |
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109 | template < typename Ch, class Tr > |
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110 | class basic_ios_iostate_saver |
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111 | { |
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112 | public: |
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113 | typedef ::std::basic_ios<Ch, Tr> state_type; |
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114 | typedef ::std::ios_base::iostate aspect_type; |
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115 | |
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116 | explicit basic_ios_iostate_saver( state_type &s ) |
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117 | : s_save_( s ), a_save_( s.rdstate() ) |
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118 | {} |
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119 | basic_ios_iostate_saver( state_type &s, aspect_type const &a ) |
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120 | : s_save_( s ), a_save_( s.rdstate() ) |
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121 | { s.clear(a); } |
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122 | ~basic_ios_iostate_saver() |
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123 | { this->restore(); } |
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124 | |
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125 | void restore() |
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126 | { s_save_.clear( a_save_ ); } |
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127 | |
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128 | private: |
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129 | state_type & s_save_; |
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130 | aspect_type const a_save_; |
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131 | basic_ios_iostate_saver& operator=(const basic_ios_iostate_saver&); |
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132 | }; |
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133 | |
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134 | template < typename Ch, class Tr > |
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135 | class basic_ios_exception_saver |
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136 | { |
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137 | public: |
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138 | typedef ::std::basic_ios<Ch, Tr> state_type; |
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139 | typedef ::std::ios_base::iostate aspect_type; |
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140 | |
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141 | explicit basic_ios_exception_saver( state_type &s ) |
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142 | : s_save_( s ), a_save_( s.exceptions() ) |
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143 | {} |
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144 | #if BOOST_WORKAROUND(__BORLANDC__, BOOST_TESTED_AT(0x582)) |
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145 | basic_ios_exception_saver( state_type &s, aspect_type a ) |
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146 | #else |
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147 | basic_ios_exception_saver( state_type &s, aspect_type const &a ) |
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148 | #endif |
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149 | : s_save_( s ), a_save_( s.exceptions() ) |
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150 | { s.exceptions(a); } |
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151 | ~basic_ios_exception_saver() |
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152 | { this->restore(); } |
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153 | |
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154 | void restore() |
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155 | { s_save_.exceptions( a_save_ ); } |
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156 | |
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157 | private: |
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158 | state_type & s_save_; |
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159 | aspect_type const a_save_; |
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160 | basic_ios_exception_saver& operator=(const basic_ios_exception_saver&); |
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161 | }; |
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162 | |
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163 | template < typename Ch, class Tr > |
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164 | class basic_ios_tie_saver |
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165 | { |
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166 | public: |
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167 | typedef ::std::basic_ios<Ch, Tr> state_type; |
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168 | typedef ::std::basic_ostream<Ch, Tr> * aspect_type; |
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169 | |
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170 | explicit basic_ios_tie_saver( state_type &s ) |
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171 | : s_save_( s ), a_save_( s.tie() ) |
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172 | {} |
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173 | basic_ios_tie_saver( state_type &s, aspect_type const &a ) |
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174 | : s_save_( s ), a_save_( s.tie(a) ) |
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175 | {} |
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176 | ~basic_ios_tie_saver() |
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177 | { this->restore(); } |
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178 | |
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179 | void restore() |
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180 | { s_save_.tie( a_save_ ); } |
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181 | |
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182 | private: |
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183 | state_type & s_save_; |
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184 | aspect_type const a_save_; |
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185 | basic_ios_tie_saver& operator=(const basic_ios_tie_saver&); |
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186 | }; |
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187 | |
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188 | template < typename Ch, class Tr > |
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189 | class basic_ios_rdbuf_saver |
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190 | { |
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191 | public: |
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192 | typedef ::std::basic_ios<Ch, Tr> state_type; |
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193 | typedef ::std::basic_streambuf<Ch, Tr> * aspect_type; |
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194 | |
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195 | explicit basic_ios_rdbuf_saver( state_type &s ) |
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196 | : s_save_( s ), a_save_( s.rdbuf() ) |
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197 | {} |
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198 | basic_ios_rdbuf_saver( state_type &s, aspect_type const &a ) |
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199 | : s_save_( s ), a_save_( s.rdbuf(a) ) |
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200 | {} |
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201 | ~basic_ios_rdbuf_saver() |
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202 | { this->restore(); } |
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203 | |
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204 | void restore() |
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205 | { s_save_.rdbuf( a_save_ ); } |
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206 | |
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207 | private: |
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208 | state_type & s_save_; |
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209 | aspect_type const a_save_; |
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210 | basic_ios_rdbuf_saver& operator=(const basic_ios_rdbuf_saver&); |
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211 | }; |
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212 | |
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213 | template < typename Ch, class Tr > |
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214 | class basic_ios_fill_saver |
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215 | { |
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216 | public: |
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217 | typedef ::std::basic_ios<Ch, Tr> state_type; |
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218 | typedef typename state_type::char_type aspect_type; |
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219 | |
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220 | explicit basic_ios_fill_saver( state_type &s ) |
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221 | : s_save_( s ), a_save_( s.fill() ) |
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222 | {} |
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223 | basic_ios_fill_saver( state_type &s, aspect_type const &a ) |
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224 | : s_save_( s ), a_save_( s.fill(a) ) |
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225 | {} |
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226 | ~basic_ios_fill_saver() |
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227 | { this->restore(); } |
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228 | |
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229 | void restore() |
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230 | { s_save_.fill( a_save_ ); } |
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231 | |
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232 | private: |
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233 | state_type & s_save_; |
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234 | aspect_type const a_save_; |
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235 | basic_ios_fill_saver& operator=(const basic_ios_fill_saver&); |
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236 | }; |
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237 | |
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238 | #ifndef BOOST_NO_STD_LOCALE |
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239 | template < typename Ch, class Tr > |
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240 | class basic_ios_locale_saver |
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241 | { |
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242 | public: |
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243 | typedef ::std::basic_ios<Ch, Tr> state_type; |
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244 | typedef ::std::locale aspect_type; |
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245 | |
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246 | explicit basic_ios_locale_saver( state_type &s ) |
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247 | : s_save_( s ), a_save_( s.getloc() ) |
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248 | {} |
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249 | basic_ios_locale_saver( state_type &s, aspect_type const &a ) |
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250 | : s_save_( s ), a_save_( s.imbue(a) ) |
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251 | {} |
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252 | ~basic_ios_locale_saver() |
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253 | { this->restore(); } |
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254 | |
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255 | void restore() |
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256 | { s_save_.imbue( a_save_ ); } |
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257 | |
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258 | private: |
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259 | state_type & s_save_; |
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260 | aspect_type const a_save_; |
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261 | basic_ios_locale_saver& operator=(const basic_ios_locale_saver&); |
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262 | }; |
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263 | #endif |
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264 | |
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265 | |
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266 | // User-defined stream state saver class declarations ----------------------// |
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267 | |
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268 | class ios_iword_saver |
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269 | { |
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270 | public: |
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271 | typedef ::std::ios_base state_type; |
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272 | typedef int index_type; |
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273 | typedef long aspect_type; |
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274 | |
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275 | explicit ios_iword_saver( state_type &s, index_type i ) |
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276 | : s_save_( s ), a_save_( s.iword(i) ), i_save_( i ) |
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277 | {} |
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278 | ios_iword_saver( state_type &s, index_type i, aspect_type const &a ) |
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279 | : s_save_( s ), a_save_( s.iword(i) ), i_save_( i ) |
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280 | { s.iword(i) = a; } |
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281 | ~ios_iword_saver() |
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282 | { this->restore(); } |
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283 | |
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284 | void restore() |
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285 | { s_save_.iword( i_save_ ) = a_save_; } |
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286 | |
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287 | private: |
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288 | state_type & s_save_; |
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289 | aspect_type const a_save_; |
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290 | index_type const i_save_; |
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291 | |
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292 | ios_iword_saver& operator=(const ios_iword_saver&); |
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293 | }; |
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294 | |
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295 | class ios_pword_saver |
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296 | { |
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297 | public: |
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298 | typedef ::std::ios_base state_type; |
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299 | typedef int index_type; |
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300 | typedef void * aspect_type; |
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301 | |
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302 | explicit ios_pword_saver( state_type &s, index_type i ) |
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303 | : s_save_( s ), a_save_( s.pword(i) ), i_save_( i ) |
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304 | {} |
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305 | ios_pword_saver( state_type &s, index_type i, aspect_type const &a ) |
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306 | : s_save_( s ), a_save_( s.pword(i) ), i_save_( i ) |
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307 | { s.pword(i) = a; } |
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308 | ~ios_pword_saver() |
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309 | { this->restore(); } |
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310 | |
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311 | void restore() |
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312 | { s_save_.pword( i_save_ ) = a_save_; } |
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313 | |
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314 | private: |
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315 | state_type & s_save_; |
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316 | aspect_type const a_save_; |
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317 | index_type const i_save_; |
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318 | |
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319 | ios_pword_saver operator=(const ios_pword_saver&); |
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320 | }; |
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321 | |
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322 | |
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323 | // Combined stream state saver class (template) declarations ---------------// |
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324 | |
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325 | class ios_base_all_saver |
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326 | { |
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327 | public: |
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328 | typedef ::std::ios_base state_type; |
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329 | |
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330 | explicit ios_base_all_saver( state_type &s ) |
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331 | : s_save_( s ), a1_save_( s.flags() ), a2_save_( s.precision() ) |
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332 | , a3_save_( s.width() ) |
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333 | {} |
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334 | |
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335 | ~ios_base_all_saver() |
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336 | { this->restore(); } |
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337 | |
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338 | void restore() |
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339 | { |
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340 | s_save_.width( a3_save_ ); |
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341 | s_save_.precision( a2_save_ ); |
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342 | s_save_.flags( a1_save_ ); |
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343 | } |
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344 | |
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345 | private: |
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346 | state_type & s_save_; |
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347 | state_type::fmtflags const a1_save_; |
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348 | ::std::streamsize const a2_save_; |
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349 | ::std::streamsize const a3_save_; |
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350 | |
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351 | ios_base_all_saver& operator=(const ios_base_all_saver&); |
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352 | }; |
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353 | |
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354 | template < typename Ch, class Tr > |
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355 | class basic_ios_all_saver |
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356 | { |
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357 | public: |
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358 | typedef ::std::basic_ios<Ch, Tr> state_type; |
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359 | |
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360 | explicit basic_ios_all_saver( state_type &s ) |
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361 | : s_save_( s ), a1_save_( s.flags() ), a2_save_( s.precision() ) |
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362 | , a3_save_( s.width() ), a4_save_( s.rdstate() ) |
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363 | , a5_save_( s.exceptions() ), a6_save_( s.tie() ) |
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364 | , a7_save_( s.rdbuf() ), a8_save_( s.fill() ) |
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365 | #ifndef BOOST_NO_STD_LOCALE |
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366 | , a9_save_( s.getloc() ) |
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367 | #endif |
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368 | {} |
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369 | |
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370 | ~basic_ios_all_saver() |
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371 | { this->restore(); } |
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372 | |
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373 | void restore() |
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374 | { |
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375 | #ifndef BOOST_NO_STD_LOCALE |
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376 | s_save_.imbue( a9_save_ ); |
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377 | #endif |
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378 | s_save_.fill( a8_save_ ); |
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379 | s_save_.rdbuf( a7_save_ ); |
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380 | s_save_.tie( a6_save_ ); |
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381 | s_save_.exceptions( a5_save_ ); |
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382 | s_save_.clear( a4_save_ ); |
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383 | s_save_.width( a3_save_ ); |
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384 | s_save_.precision( a2_save_ ); |
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385 | s_save_.flags( a1_save_ ); |
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386 | } |
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387 | |
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388 | private: |
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389 | state_type & s_save_; |
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390 | typename state_type::fmtflags const a1_save_; |
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391 | ::std::streamsize const a2_save_; |
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392 | ::std::streamsize const a3_save_; |
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393 | typename state_type::iostate const a4_save_; |
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394 | typename state_type::iostate const a5_save_; |
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395 | ::std::basic_ostream<Ch, Tr> * const a6_save_; |
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396 | ::std::basic_streambuf<Ch, Tr> * const a7_save_; |
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397 | typename state_type::char_type const a8_save_; |
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398 | #ifndef BOOST_NO_STD_LOCALE |
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399 | ::std::locale const a9_save_; |
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400 | #endif |
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401 | |
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402 | basic_ios_all_saver& operator=(const basic_ios_all_saver&); |
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403 | }; |
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404 | |
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405 | class ios_all_word_saver |
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406 | { |
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407 | public: |
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408 | typedef ::std::ios_base state_type; |
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409 | typedef int index_type; |
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410 | |
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411 | ios_all_word_saver( state_type &s, index_type i ) |
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412 | : s_save_( s ), i_save_( i ), a1_save_( s.iword(i) ) |
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413 | , a2_save_( s.pword(i) ) |
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414 | {} |
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415 | |
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416 | ~ios_all_word_saver() |
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417 | { this->restore(); } |
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418 | |
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419 | void restore() |
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420 | { |
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421 | s_save_.pword( i_save_ ) = a2_save_; |
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422 | s_save_.iword( i_save_ ) = a1_save_; |
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423 | } |
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424 | |
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425 | private: |
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426 | state_type & s_save_; |
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427 | index_type const i_save_; |
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428 | long const a1_save_; |
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429 | void * const a2_save_; |
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430 | |
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431 | ios_all_word_saver& operator=(const ios_all_word_saver&); |
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432 | }; |
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433 | |
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434 | |
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435 | } // namespace io |
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436 | } // namespace boost |
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437 | |
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438 | |
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439 | #endif // BOOST_IO_IOS_STATE_HPP |
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