forked from boostorg/conversion
79 lines
2.4 KiB
C++
79 lines
2.4 KiB
C++
// boost lexical_cast.hpp header -------------------------------------------//
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// See http://www.boost.org for most recent version including documentation.
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#ifndef BOOST_LEXICAL_CAST_INCLUDED
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#define BOOST_LEXICAL_CAST_INCLUDED
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// what: lexical_cast custom keyword cast
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// who: contributed by Kevlin Henney, with alternative naming, behaviors
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// and fixes contributed by Dave Abrahams, Daryle Walker and other
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// Boosters on the list
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// when: November 2000
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// where: tested with MSVC 6.0, BCC 5.5, and g++ 2.91
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#include <boost/config.hpp>
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// The GNU sstream implementation is broken for the purposes of lexical cast.
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# if defined(BOOST_NO_STRINGSTREAM) || (defined(__GNUC__) && !defined(__STL_USE_NEW_IOSTREAMS) || defined(__APPLE_CC__))
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# define BOOST_LEXICAL_CAST_USE_STRSTREAM
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# endif
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#ifdef BOOST_LEXICAL_CAST_USE_STRSTREAM
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# include <strstream>
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#else
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# include <sstream>
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#endif
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#include <typeinfo>
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namespace boost
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{
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// exception used to indicate runtime lexical_cast failure
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class bad_lexical_cast : public std::bad_cast
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{
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public:
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// constructors, destructors, and assignment operator defaulted
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// function inlined for brevity and consistency with rest of library
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virtual const char * what() const throw()
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{
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return "bad lexical cast: "
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"source type value could not be interpreted as target";
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}
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};
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template<typename Target, typename Source>
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Target lexical_cast(Source arg)
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{
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# ifdef BOOST_LEXICAL_CAST_USE_STRSTREAM
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std::strstream interpreter; // for out-of-the-box g++ 2.95.2
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# else
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std::stringstream interpreter;
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# endif
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Target result;
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if(!(interpreter << arg) || !(interpreter >> result) ||
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!(interpreter >> std::ws).eof())
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throw bad_lexical_cast();
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return result;
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}
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}
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// Copyright Kevlin Henney, 2000. All rights reserved.
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//
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// Permission to use, copy, modify, and distribute this software for any
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// purpose is hereby granted without fee, provided that this copyright and
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// permissions notice appear in all copies and derivatives, and that no
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// charge may be made for the software and its documentation except to cover
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// cost of distribution.
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//
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// This software is provided "as is" without express or implied warranty.
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#ifdef BOOST_LEXICAL_CAST_USE_STRSTREAM
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# undef BOOST_LEXICAL_CAST_USE_STRSTREAM
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#endif
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#endif
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