// Copyright Kevlin Henney, 2000-2005.
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// Copyright Alexander Nasonov, 2006-2010.
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// Copyright Antony Polukhin, 2011-2020.
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//
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// Distributed under the Boost Software License, Version 1.0. (See
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// 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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//
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// what: lexical_cast custom keyword cast
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// who: contributed by Kevlin Henney,
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// enhanced with contributions from Terje Slettebo,
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// with additional fixes and suggestions from Gennaro Prota,
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// Beman Dawes, Dave Abrahams, Daryle Walker, Peter Dimov,
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// Alexander Nasonov, Antony Polukhin, Justin Viiret, Michael Hofmann,
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// Cheng Yang, Matthew Bradbury, David W. Birdsall, Pavel Korzh and other Boosters
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// when: November 2000, March 2003, June 2005, June 2006, March 2011 - 2014
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#ifndef BOOST_LEXICAL_CAST_BAD_LEXICAL_CAST_HPP
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#define BOOST_LEXICAL_CAST_BAD_LEXICAL_CAST_HPP
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#include <boost/config.hpp>
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#ifdef BOOST_HAS_PRAGMA_ONCE
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# pragma once
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#endif
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#include <exception>
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#include <typeinfo>
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#include <boost/throw_exception.hpp>
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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 BOOST_SYMBOL_VISIBLE bad_lexical_cast :
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// workaround MSVC bug with std::bad_cast when _HAS_EXCEPTIONS == 0
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#if defined(BOOST_MSVC) && defined(_HAS_EXCEPTIONS) && !_HAS_EXCEPTIONS
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public std::exception
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#else
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public std::bad_cast
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#endif
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#if defined(BOOST_BORLANDC) && BOOST_WORKAROUND( BOOST_BORLANDC, < 0x560 )
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// under bcc32 5.5.1 bad_cast doesn't derive from exception
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, public std::exception
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#endif
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{
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public:
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bad_lexical_cast() BOOST_NOEXCEPT
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#ifndef BOOST_NO_TYPEID
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: source(&typeid(void)), target(&typeid(void))
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#endif
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{}
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const char *what() const BOOST_NOEXCEPT_OR_NOTHROW BOOST_OVERRIDE {
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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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~bad_lexical_cast() BOOST_NOEXCEPT_OR_NOTHROW BOOST_OVERRIDE
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{}
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#ifndef BOOST_NO_TYPEID
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private:
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#ifdef BOOST_NO_STD_TYPEINFO
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typedef ::type_info type_info_t;
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#else
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typedef ::std::type_info type_info_t;
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#endif
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public:
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bad_lexical_cast(
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const type_info_t &source_type_arg,
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const type_info_t &target_type_arg) BOOST_NOEXCEPT
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: source(&source_type_arg), target(&target_type_arg)
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{}
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const type_info_t &source_type() const BOOST_NOEXCEPT {
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return *source;
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}
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const type_info_t &target_type() const BOOST_NOEXCEPT {
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return *target;
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}
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private:
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const type_info_t *source;
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const type_info_t *target;
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#endif
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};
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namespace conversion { namespace detail {
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#ifdef BOOST_NO_TYPEID
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template <class S, class T>
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inline void throw_bad_cast() {
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boost::throw_exception(bad_lexical_cast());
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}
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#else
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template <class S, class T>
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inline void throw_bad_cast() {
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boost::throw_exception(bad_lexical_cast(typeid(S), typeid(T)));
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}
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#endif
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}} // namespace conversion::detail
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} // namespace boost
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#endif // BOOST_LEXICAL_CAST_BAD_LEXICAL_CAST_HPP
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