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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 mpl::false_&)
{
#ifdef BOOST_MATH_NO_LEXICAL_CAST
// This function should not compile, we don't have the necesary 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 mpl::true_&) 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
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