50 lines
1.3 KiB
C++
50 lines
1.3 KiB
C++
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// Copyright 2018 Peter Dimov.
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//
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// Distributed under the Boost Software License, Version 1.0.
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//
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// See accompanying file LICENSE_1_0.txt or copy at
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// http://www.boost.org/LICENSE_1_0.txt
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#include <boost/wave.hpp>
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#include <boost/wave/cpplexer/cpp_lex_token.hpp>
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#include <boost/wave/cpplexer/cpp_lex_iterator.hpp>
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#include <iostream>
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int main()
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{
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std::string input(
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"#if 0\n"
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"6.28\n"
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"#else\n"
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"3.14\n"
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"#endif\n"
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);
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try
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{
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typedef boost::wave::cpplexer::lex_token<> token_type;
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typedef boost::wave::cpplexer::lex_iterator<token_type> lex_iterator_type;
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typedef boost::wave::context<std::string::iterator, lex_iterator_type> context_type;
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context_type ctx( input.begin(), input.end(), "input.cpp" );
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for( context_type::iterator_type first = ctx.begin(), last = ctx.end(); first != last; ++first )
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{
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std::cout << first->get_value();
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}
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return 0;
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}
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catch( boost::wave::cpp_exception const & x )
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{
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std::cerr << x.file_name() << "(" << x.line_no() << "): " << x.description() << std::endl;
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return 1;
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}
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catch( std::exception const & x )
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{
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std::cerr << "Exception: " << x.what() << std::endl;
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return 2;
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}
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}
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