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// Copyright John Maddock 2016. // Use, modification and distribution are subject to 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) #ifndef BOOST_MATH_TOOLS_CONVERT_FROM_STRING_INCLUDED #define BOOST_MATH_TOOLS_CONVERT_FROM_STRING_INCLUDED #ifdef _MSC_VER #pragma once #endif #include <boost/type_traits/is_constructible.hpp> #include <boost/type_traits/conditional.hpp> #include <boost/lexical_cast.hpp> namespace boost{ namespace math{ namespace tools{ template <class T> struct convert_from_string_result { typedef typename boost::conditional<boost::is_constructible<T, const char>::value, const char, T>::type type; }; template <class Real> Real convert_from_string(const char* p, const boost::false_type&) { #ifdef BOOST_MATH_NO_LEXICAL_CAST // This function should not compile, we don't have the necessary functionality to support it: BOOST_STATIC_ASSERT(sizeof(Real) == 0); #else return boost::lexical_cast<Real>(p); #endif } template <class Real> BOOST_CONSTEXPR const char* convert_from_string(const char* p, const boost::true_type&) BOOST_NOEXCEPT { return p; } template <class Real> BOOST_CONSTEXPR typename convert_from_string_result<Real>::type convert_from_string(const char* p) BOOST_NOEXCEPT_IF((boost::is_constructible<Real, const char>::value)) { return convert_from_string<Real>(p, boost::is_constructible<Real, const char>()); } } // namespace tools } // namespace math } // namespace boost #endif // BOOST_MATH_TOOLS_CONVERT_FROM_STRING_INCLUDED