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[SVN r13766]
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Beman Dawes
253
test/ios_state_test.cpp
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253
test/ios_state_test.cpp
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// Boost ios_state_test.cpp test file --------------------------------------//
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// (C) Copyright Daryle Walker 2002. Permission to copy, use, modify, sell and
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// distribute this software is granted provided this copyright notice appears
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// in all copies. This software is provided "as is" without express or implied
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// warranty, and with no claim as to its suitability for any purpose.
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// Revision History
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// 26 Feb 2002 Initial version (Daryle Walker)
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#define BOOST_INCLUDE_MAIN
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#include <boost/test/test_tools.hpp> // main, BOOST_TEST, etc.
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#include <boost/cstdlib.hpp> // for boost::exit_success
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#include <boost/io/ios_state.hpp> // for boost::io::ios_flags_saver, etc.
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#include <iomanip> // for std::setw
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#include <ios> // for std::ios_base, std::streamsize, etc.
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#include <iostream> // for std::cout, etc.
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#include <istream> // for std::istream
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#include <locale> // for std::numpunct_byname, std::locale
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#include <ostream> // for std::endl, std::ostream
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#include <streambuf> // for std::streambuf
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#include <string> // for std::string
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// Facet with the bool names spelled backwards
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class backward_bool_names
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: public std::numpunct_byname<char>
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{
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typedef std::numpunct_byname<char> base_type;
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public:
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explicit backward_bool_names( char const *name )
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: base_type( name )
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{}
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protected:
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virtual string_type do_truename() const
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{ return "eurt"; }
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virtual string_type do_falsename() const
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{ return "eslaf"; }
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};
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// Index to test custom storage
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int const my_index = std::ios_base::xalloc();
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// Test data
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char const test_string[] = "Hello world";
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int const test_num1 = -16;
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double const test_num2 = 34.5678901234;
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bool const test_bool = true;
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// Function prototypes
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void saver_tests_1( std::istream &input, std::ostream &output,
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std::ostream &err );
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void saver_tests_2( std::istream &input, std::ostream &output,
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std::ostream &err );
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// Test program
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int
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test_main
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(
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int , // "argc" is unused
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char * [] // "argv" is unused
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)
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{
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using std::cout;
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using std::ios_base;
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using std::streamsize;
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using std::cin;
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cout << "The original data is:\n";
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cout << '\t' << test_string << '\n';
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cout << '\t' << test_num1 << '\n';
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cout << '\t' << test_num2 << '\n';
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cout << '\t' << std::boolalpha << test_bool << std::endl;
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// Save states for comparison later
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ios_base::fmtflags const cout_flags = cout.flags();
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streamsize const cout_precision = cout.precision();
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streamsize const cout_width = cout.width();
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ios_base::iostate const cout_iostate = cout.rdstate();
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ios_base::iostate const cout_exceptions = cout.exceptions();
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std::ostream * const cin_tie = cin.tie();
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std::streambuf * const cout_sb = cout.rdbuf();
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char const cout_fill = cout.fill();
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std::locale const cout_locale = cout.getloc();
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cout.iword( my_index ) = 42L;
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cout.pword( my_index ) = &cin;
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// Run saver tests with changing separate from saving
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saver_tests_1( cin, cout, std::cerr );
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// Check if states are back to normal
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BOOST_TEST( &cin == cout.pword(my_index) );
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BOOST_TEST( 42L == cout.iword(my_index) );
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BOOST_TEST( cout_locale == cout.getloc() );
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BOOST_TEST( cout_fill == cout.fill() );
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BOOST_TEST( cout_sb == cout.rdbuf() );
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BOOST_TEST( cin_tie == cin.tie() );
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BOOST_TEST( cout_exceptions == cout.exceptions() );
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BOOST_TEST( cout_iostate == cout.rdstate() );
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BOOST_TEST( cout_width == cout.width() );
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BOOST_TEST( cout_precision == cout.precision() );
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BOOST_TEST( cout_flags == cout.flags() );
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// Run saver tests with combined saving and changing
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saver_tests_2( cin, cout, std::cerr );
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// Check if states are back to normal
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BOOST_TEST( &cin == cout.pword(my_index) );
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BOOST_TEST( 42L == cout.iword(my_index) );
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BOOST_TEST( cout_locale == cout.getloc() );
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BOOST_TEST( cout_fill == cout.fill() );
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BOOST_TEST( cout_sb == cout.rdbuf() );
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BOOST_TEST( cin_tie == cin.tie() );
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BOOST_TEST( cout_exceptions == cout.exceptions() );
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BOOST_TEST( cout_iostate == cout.rdstate() );
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BOOST_TEST( cout_width == cout.width() );
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BOOST_TEST( cout_precision == cout.precision() );
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BOOST_TEST( cout_flags == cout.flags() );
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return boost::exit_success;
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}
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// Save, change, and restore stream properties
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void
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saver_tests_1
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(
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std::istream & input,
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std::ostream & output,
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std::ostream & err
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)
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{
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using std::locale;
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using std::ios_base;
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using std::setw;
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boost::io::ios_flags_saver const ifls( output );
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boost::io::ios_precision_saver const iprs( output );
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boost::io::ios_width_saver const iws( output );
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boost::io::ios_tie_saver const its( input );
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boost::io::ios_rdbuf_saver const irs( output );
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boost::io::ios_fill_saver const ifis( output );
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boost::io::ios_locale_saver const ils( output );
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boost::io::ios_iword_saver const iis( output, my_index );
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boost::io::ios_pword_saver const ipws( output, my_index );
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locale loc( locale(""), new backward_bool_names("") );
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input.tie( &err );
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output.rdbuf( err.rdbuf() );
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output.iword( my_index ) = 69L;
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output.pword( my_index ) = &err;
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output << "The data is (again):\n";
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output.setf( ios_base::showpos | ios_base::boolalpha );
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output.setf( ios_base::internal, ios_base::adjustfield );
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output.fill( '@' );
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output.precision( 9 );
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output << '\t' << test_string << '\n';
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output << '\t' << setw( 10 ) << test_num1 << '\n';
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output << '\t' << setw( 15 ) << test_num2 << '\n';
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output.imbue( loc );
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output << '\t' << test_bool << '\n';
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BOOST_TEST( &err == output.pword(my_index) );
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BOOST_TEST( 69L == output.iword(my_index) );
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try
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{
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boost::io::ios_exception_saver const ies( output );
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boost::io::ios_iostate_saver const iis( output );
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output.exceptions( ios_base::eofbit );
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output.setstate( ios_base::eofbit );
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BOOST_ERROR( "previous line should have thrown" );
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}
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catch ( ios_base::failure &f )
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{
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err << "Got the expected I/O failure: \"" << f.what() << "\".\n";
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BOOST_TEST( output.exceptions() == ios_base::goodbit );
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}
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catch ( ... )
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{
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err << "Got an unknown error when doing exception test!\n";
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throw;
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}
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}
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// Save & change and restore stream properties
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void
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saver_tests_2
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(
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std::istream & input,
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std::ostream & output,
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std::ostream & err
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)
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{
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using std::locale;
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using std::ios_base;
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boost::io::ios_tie_saver const its( input, &err );
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boost::io::ios_rdbuf_saver const irs( output, err.rdbuf() );
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boost::io::ios_iword_saver const iis( output, my_index, 69L );
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boost::io::ios_pword_saver const ipws( output, my_index, &err );
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output << "The data is (a third time; adding the numbers):\n";
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boost::io::ios_flags_saver const ifls( output, (output.flags()
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& ~ios_base::adjustfield) | ios_base::showpos | ios_base::boolalpha
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| (ios_base::internal & ios_base::adjustfield) );
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boost::io::ios_precision_saver const iprs( output, 9 );
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boost::io::ios_fill_saver const ifis( output, '@' );
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output << '\t' << test_string << '\n';
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boost::io::ios_width_saver const iws( output, 12 );
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output.put( '\t' );
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output << test_num1 + test_num2;
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output.put( '\n' );
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locale loc( locale(""),
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new backward_bool_names("") );
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boost::io::ios_locale_saver const ils( output, loc );
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output << '\t' << test_bool << '\n';
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BOOST_TEST( &err == output.pword(my_index) );
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BOOST_TEST( 69L == output.iword(my_index) );
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try
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{
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boost::io::ios_exception_saver const ies( output, ios_base::eofbit );
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boost::io::ios_iostate_saver const iis( output, output.rdstate()
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| ios_base::eofbit );
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BOOST_ERROR( "previous line should have thrown" );
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}
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catch ( ios_base::failure &f )
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{
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err << "Got the expected I/O failure: \"" << f.what() << "\".\n";
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BOOST_TEST( output.exceptions() == ios_base::goodbit );
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}
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catch ( ... )
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{
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err << "Got an unknown error when doing exception test!\n";
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throw;
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}
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}
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