1 // Boost ios_state_test.cpp test file --------------------------------------//
3 // Copyright 2002, 2003 Daryle Walker. Use, modification, and distribution are
4 // subject to the Boost Software License, Version 1.0. (See accompanying file
5 // LICENSE_1_0.txt or a copy at <http://www.boost.org/LICENSE_1_0.txt>.)
7 // See <http://www.boost.org/libs/io/> for the library's home page.
10 // 15 Jun 2003 Adjust to changes in Boost.Test (Daryle Walker)
11 // 26 Feb 2002 Initial version (Daryle Walker)
13 #include <boost/config.hpp>
14 #include <boost/test/minimal.hpp> // main, BOOST_CHECK, etc.
16 #include <boost/cstdlib.hpp> // for boost::exit_success
17 #include <boost/io/ios_state.hpp> // for boost::io::ios_flags_saver, etc.
19 #include <cstddef> // for std::size_t
20 #include <iomanip> // for std::setw
21 #include <ios> // for std::ios_base, std::streamsize, etc.
22 #include <iostream> // for std::cout, etc.
23 #include <istream> // for std::istream
24 #include <locale> // for std::numpunct, std::locale
25 #include <ostream> // for std::endl, std::ostream
26 #include <streambuf> // for std::streambuf
27 #include <string> // for std::string
28 #if defined(BOOST_GCC) || (defined(BOOST_CLANG) && defined(BOOST_GNU_STDLIB))
32 // Facet with the bool names spelled backwards
33 class backward_bool_names
34 : public std::numpunct<char>
36 typedef std::numpunct<char> base_type;
39 explicit backward_bool_names( std::size_t refs = 0 )
44 virtual ~backward_bool_names() {}
46 virtual base_type::string_type do_truename() const
48 virtual base_type::string_type do_falsename() const
53 // Index to test custom storage
54 int const my_index = std::ios_base::xalloc();
57 char const test_string[] = "Hello world";
58 int const test_num1 = -16;
59 double const test_num2 = 34.5678901234;
60 bool const test_bool = true;
63 // Function prototypes
64 void saver_tests_1( std::istream &input, std::ostream &output,
66 void saver_tests_2( std::istream &input, std::ostream &output,
74 int , // "argc" is unused
75 char * [] // "argv" is unused
80 using std::streamsize;
83 cout << "The original data is:\n";
84 cout << '\t' << test_string << '\n';
85 cout << '\t' << test_num1 << '\n';
86 cout << '\t' << test_num2 << '\n';
87 cout << '\t' << std::boolalpha << test_bool << std::endl;
89 // Save states for comparison later
90 ios_base::fmtflags const cout_flags = cout.flags();
91 streamsize const cout_precision = cout.precision();
92 streamsize const cout_width = cout.width();
93 ios_base::iostate const cout_iostate = cout.rdstate();
94 ios_base::iostate const cout_exceptions = cout.exceptions();
95 std::ostream * const cin_tie = cin.tie();
96 std::streambuf * const cout_sb = cout.rdbuf();
97 char const cout_fill = cout.fill();
98 std::locale const cout_locale = cout.getloc();
100 cout.iword( my_index ) = 42L;
101 cout.pword( my_index ) = &cin;
103 // Run saver tests with changing separate from saving
104 saver_tests_1( cin, cout, std::cerr );
106 // Check if states are back to normal
107 BOOST_CHECK( &cin == cout.pword(my_index) );
108 BOOST_CHECK( 42L == cout.iword(my_index) );
109 BOOST_CHECK( cout_locale == cout.getloc() );
110 BOOST_CHECK( cout_fill == cout.fill() );
111 BOOST_CHECK( cout_sb == cout.rdbuf() );
112 BOOST_CHECK( cin_tie == cin.tie() );
113 BOOST_CHECK( cout_exceptions == cout.exceptions() );
114 BOOST_CHECK( cout_iostate == cout.rdstate() );
115 BOOST_CHECK( cout_width == cout.width() );
116 BOOST_CHECK( cout_precision == cout.precision() );
117 BOOST_CHECK( cout_flags == cout.flags() );
119 // Run saver tests with combined saving and changing
120 saver_tests_2( cin, cout, std::cerr );
122 // Check if states are back to normal
123 BOOST_CHECK( &cin == cout.pword(my_index) );
124 BOOST_CHECK( 42L == cout.iword(my_index) );
125 BOOST_CHECK( cout_locale == cout.getloc() );
126 BOOST_CHECK( cout_fill == cout.fill() );
127 BOOST_CHECK( cout_sb == cout.rdbuf() );
128 BOOST_CHECK( cin_tie == cin.tie() );
129 BOOST_CHECK( cout_exceptions == cout.exceptions() );
130 BOOST_CHECK( cout_iostate == cout.rdstate() );
131 BOOST_CHECK( cout_width == cout.width() );
132 BOOST_CHECK( cout_precision == cout.precision() );
133 BOOST_CHECK( cout_flags == cout.flags() );
135 return boost::exit_success;
138 // Save, change, and restore stream properties
142 std::istream & input,
143 std::ostream & output,
151 boost::io::ios_flags_saver const ifls( output );
152 boost::io::ios_precision_saver const iprs( output );
153 boost::io::ios_width_saver const iws( output );
154 boost::io::ios_tie_saver const its( input );
155 boost::io::ios_rdbuf_saver const irs( output );
156 boost::io::ios_fill_saver const ifis( output );
157 boost::io::ios_locale_saver const ils( output );
158 boost::io::ios_iword_saver const iis( output, my_index );
159 boost::io::ios_pword_saver const ipws( output, my_index );
161 locale loc( locale::classic(), new backward_bool_names );
164 output.rdbuf( err.rdbuf() );
165 output.iword( my_index ) = 69L;
166 output.pword( my_index ) = &err;
168 output << "The data is (again):\n";
169 output.setf( ios_base::showpos | ios_base::boolalpha );
170 output.setf( ios_base::internal, ios_base::adjustfield );
172 output.precision( 9 );
173 output << '\t' << test_string << '\n';
174 output << '\t' << setw( 10 ) << test_num1 << '\n';
175 output << '\t' << setw( 15 ) << test_num2 << '\n';
177 output << '\t' << test_bool << '\n';
179 BOOST_CHECK( &err == output.pword(my_index) );
180 BOOST_CHECK( 69L == output.iword(my_index) );
184 boost::io::ios_exception_saver const ies( output );
185 boost::io::ios_iostate_saver const iis( output );
187 output.exceptions( ios_base::eofbit | ios_base::badbit );
188 output.setstate( ios_base::eofbit );
189 BOOST_ERROR( "previous line should have thrown" );
191 #if defined(BOOST_GCC) || (defined(BOOST_CLANG) && defined(BOOST_GNU_STDLIB))
192 catch ( std::exception &f )
194 catch ( ios_base::failure &f )
197 err << "Got the expected I/O failure: \"" << f.what() << "\".\n";
198 BOOST_CHECK( output.exceptions() == ios_base::goodbit );
202 err << "Got an unknown error when doing exception test!\n";
207 // Save & change and restore stream properties
211 std::istream & input,
212 std::ostream & output,
219 boost::io::ios_tie_saver const its( input, &err );
220 boost::io::ios_rdbuf_saver const irs( output, err.rdbuf() );
221 boost::io::ios_iword_saver const iis( output, my_index, 69L );
222 boost::io::ios_pword_saver const ipws( output, my_index, &err );
223 output << "The data is (a third time; adding the numbers):\n";
225 boost::io::ios_flags_saver const ifls( output, (output.flags()
226 & ~ios_base::adjustfield) | ios_base::showpos | ios_base::boolalpha
227 | (ios_base::internal & ios_base::adjustfield) );
228 boost::io::ios_precision_saver const iprs( output, 9 );
229 boost::io::ios_fill_saver const ifis( output, '@' );
230 output << '\t' << test_string << '\n';
232 boost::io::ios_width_saver const iws( output, 12 );
234 output << test_num1 + test_num2;
237 locale loc( locale::classic(),
238 new backward_bool_names );
239 boost::io::ios_locale_saver const ils( output, loc );
240 output << '\t' << test_bool << '\n';
242 BOOST_CHECK( &err == output.pword(my_index) );
243 BOOST_CHECK( 69L == output.iword(my_index) );
247 boost::io::ios_exception_saver const ies( output, ios_base::eofbit );
248 boost::io::ios_iostate_saver const iis( output, output.rdstate()
249 | ios_base::eofbit );
251 BOOST_ERROR( "previous line should have thrown" );
253 #if defined(BOOST_GCC) || (defined(BOOST_CLANG) && defined(BOOST_GNU_STDLIB))
254 catch ( std::exception &f )
256 catch ( ios_base::failure &f )
259 err << "Got the expected I/O failure: \"" << f.what() << "\".\n";
260 BOOST_CHECK( output.exceptions() == ios_base::goodbit );
264 err << "Got an unknown error when doing exception test!\n";