94 lines
3.4 KiB
C++
94 lines
3.4 KiB
C++
// Copyright Kevlin Henney, 2000-2005.
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// Copyright Alexander Nasonov, 2006-2010.
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// Copyright Antony Polukhin, 2011-2024.
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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_TRY_LEXICAL_CONVERT_HPP
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#define BOOST_LEXICAL_CAST_TRY_LEXICAL_CONVERT_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 <boost/type_traits/conditional.hpp>
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#include <boost/type_traits/is_arithmetic.hpp>
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#include <boost/lexical_cast/detail/buffer_view.hpp>
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#include <boost/lexical_cast/detail/is_character.hpp>
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#include <boost/lexical_cast/detail/converter_numeric.hpp>
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#include <boost/lexical_cast/detail/converter_lexical.hpp>
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namespace boost {
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namespace detail
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{
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template<typename Target, typename Source>
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using is_arithmetic_and_not_xchars = boost::integral_constant<
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bool,
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!(boost::detail::is_character<Target>::value) &&
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!(boost::detail::is_character<Source>::value) &&
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boost::is_arithmetic<Source>::value &&
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boost::is_arithmetic<Target>::value
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>;
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}
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namespace conversion { namespace detail {
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template <typename Target, typename Source>
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inline bool try_lexical_convert(const Source& arg, Target& result)
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{
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static_assert(
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!boost::is_volatile<Source>::value,
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"Boost.LexicalCast does not support volatile input");
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typedef typename boost::detail::array_to_pointer_decay<Source>::type src;
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typedef boost::detail::is_arithmetic_and_not_xchars<Target, src >
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shall_we_copy_with_dynamic_check_t;
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typedef typename boost::conditional<
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shall_we_copy_with_dynamic_check_t::value,
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boost::detail::dynamic_num_converter_impl<Target, src >,
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boost::detail::lexical_converter_impl<Target, src >
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>::type caster_type;
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return caster_type::try_convert(arg, result);
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}
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template <typename Target, typename CharacterT>
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inline bool try_lexical_convert(const CharacterT* chars, std::size_t count, Target& result)
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{
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static_assert(
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boost::detail::is_character<CharacterT>::value,
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"This overload of try_lexical_convert is meant to be used only with arrays of characters."
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);
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return ::boost::conversion::detail::try_lexical_convert(
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::boost::conversion::detail::make_buffer_view(chars, chars + count),
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result
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);
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}
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}} // namespace conversion::detail
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namespace conversion {
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// ADL barrier
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using ::boost::conversion::detail::try_lexical_convert;
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}
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} // namespace boost
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#endif // BOOST_LEXICAL_CAST_TRY_LEXICAL_CONVERT_HPP
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