| 1 | |
|---|---|
| 2 | // Copyright 2018 Peter Dimov. |
| 3 | // |
| 4 | // Distributed under the Boost Software License, Version 1.0. |
| 5 | // |
| 6 | // See accompanying file LICENSE_1_0.txt or copy at |
| 7 | // http://www.boost.org/LICENSE_1_0.txt |
| 8 | |
| 9 | #include <boost/wave.hpp> |
| 10 | #include <boost/wave/cpplexer/cpp_lex_token.hpp> |
| 11 | #include <boost/wave/cpplexer/cpp_lex_iterator.hpp> |
| 12 | #include <iostream> |
| 13 | |
| 14 | int main() |
| 15 | { |
| 16 | std::string input( |
| 17 | "#if 0\n" |
| 18 | "6.28\n" |
| 19 | "#else\n" |
| 20 | "3.14\n" |
| 21 | "#endif\n" |
| 22 | ); |
| 23 | |
| 24 | try |
| 25 | { |
| 26 | typedef boost::wave::cpplexer::lex_token<> token_type; |
| 27 | typedef boost::wave::cpplexer::lex_iterator<token_type> lex_iterator_type; |
| 28 | typedef boost::wave::context<std::string::iterator, lex_iterator_type> context_type; |
| 29 | |
| 30 | context_type ctx( input.begin(), input.end(), "input.cpp"); |
| 31 | |
| 32 | for( context_type::iterator_type first = ctx.begin(), last = ctx.end(); first != last; ++first ) |
| 33 | { |
| 34 | std::cout << first->get_value(); |
| 35 | } |
| 36 | |
| 37 | return 0; |
| 38 | } |
| 39 | catch( boost::wave::cpp_exception const & x ) |
| 40 | { |
| 41 | std::cerr << x.file_name() << "("<< x.line_no() << "): "<< x.description() << std::endl; |
| 42 | return 1; |
| 43 | } |
| 44 | catch( std::exception const & x ) |
| 45 | { |
| 46 | std::cerr << "Exception: "<< x.what() << std::endl; |
| 47 | return 2; |
| 48 | } |
| 49 | } |
| 50 |