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- // Copyright Kevlin Henney, 2000-2005.
- // Copyright Alexander Nasonov, 2006-2010.
- // Copyright Antony Polukhin, 2011-2021.
- //
- // Distributed under the Boost Software License, Version 1.0. (See
- // accompanying file LICENSE_1_0.txt or copy at
- // http://www.boost.org/LICENSE_1_0.txt)
- //
- // what: lexical_cast custom keyword cast
- // who: contributed by Kevlin Henney,
- // enhanced with contributions from Terje Slettebo,
- // with additional fixes and suggestions from Gennaro Prota,
- // Beman Dawes, Dave Abrahams, Daryle Walker, Peter Dimov,
- // Alexander Nasonov, Antony Polukhin, Justin Viiret, Michael Hofmann,
- // Cheng Yang, Matthew Bradbury, David W. Birdsall, Pavel Korzh and other Boosters
- // when: November 2000, March 2003, June 2005, June 2006, March 2011 - 2014
- #ifndef BOOST_LEXICAL_CAST_BAD_LEXICAL_CAST_HPP
- #define BOOST_LEXICAL_CAST_BAD_LEXICAL_CAST_HPP
- #include <boost/config.hpp>
- #ifdef BOOST_HAS_PRAGMA_ONCE
- # pragma once
- #endif
- #include <exception>
- #include <typeinfo>
- #include <boost/throw_exception.hpp>
- namespace boost
- {
- // exception used to indicate runtime lexical_cast failure
- class BOOST_SYMBOL_VISIBLE bad_lexical_cast :
- // workaround MSVC bug with std::bad_cast when _HAS_EXCEPTIONS == 0
- #if defined(BOOST_MSVC) && defined(_HAS_EXCEPTIONS) && !_HAS_EXCEPTIONS
- public std::exception
- #else
- public std::bad_cast
- #endif
- #if defined(BOOST_BORLANDC) && BOOST_WORKAROUND( BOOST_BORLANDC, < 0x560 )
- // under bcc32 5.5.1 bad_cast doesn't derive from exception
- , public std::exception
- #endif
- {
- public:
- bad_lexical_cast() BOOST_NOEXCEPT
- #ifndef BOOST_NO_TYPEID
- : source(&typeid(void)), target(&typeid(void))
- #endif
- {}
- const char *what() const BOOST_NOEXCEPT_OR_NOTHROW BOOST_OVERRIDE {
- return "bad lexical cast: "
- "source type value could not be interpreted as target";
- }
- ~bad_lexical_cast() BOOST_NOEXCEPT_OR_NOTHROW BOOST_OVERRIDE
- {}
- #ifndef BOOST_NO_TYPEID
- private:
- #ifdef BOOST_NO_STD_TYPEINFO
- typedef ::type_info type_info_t;
- #else
- typedef ::std::type_info type_info_t;
- #endif
- public:
- bad_lexical_cast(
- const type_info_t &source_type_arg,
- const type_info_t &target_type_arg) BOOST_NOEXCEPT
- : source(&source_type_arg), target(&target_type_arg)
- {}
- const type_info_t &source_type() const BOOST_NOEXCEPT {
- return *source;
- }
- const type_info_t &target_type() const BOOST_NOEXCEPT {
- return *target;
- }
- private:
- const type_info_t *source;
- const type_info_t *target;
- #endif
- };
- namespace conversion { namespace detail {
- #ifdef BOOST_NO_TYPEID
- template <class S, class T>
- inline void throw_bad_cast() {
- boost::throw_exception(bad_lexical_cast());
- }
- #else
- template <class S, class T>
- inline void throw_bad_cast() {
- boost::throw_exception(bad_lexical_cast(typeid(S), typeid(T)));
- }
- #endif
- }} // namespace conversion::detail
- } // namespace boost
- #endif // BOOST_LEXICAL_CAST_BAD_LEXICAL_CAST_HPP
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