52 lines
1.7 KiB
Plaintext
52 lines
1.7 KiB
Plaintext
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// Copyright John Maddock 2016.
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// Use, modification and distribution are subject to the
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// Boost Software License, Version 1.0. (See accompanying file
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// LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt)
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#ifndef BOOST_MATH_TOOLS_CONVERT_FROM_STRING_INCLUDED
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#define BOOST_MATH_TOOLS_CONVERT_FROM_STRING_INCLUDED
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#ifdef _MSC_VER
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#pragma once
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#endif
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#include <boost/type_traits/is_constructible.hpp>
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#include <boost/type_traits/conditional.hpp>
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#include <boost/lexical_cast.hpp>
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namespace boost{ namespace math{ namespace tools{
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template <class T>
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struct convert_from_string_result
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{
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typedef typename boost::conditional<boost::is_constructible<T, const char*>::value, const char*, T>::type type;
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};
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template <class Real>
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Real convert_from_string(const char* p, const mpl::false_&)
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{
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#ifdef BOOST_MATH_NO_LEXICAL_CAST
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// This function should not compile, we don't have the necesary functionality to support it:
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BOOST_STATIC_ASSERT(sizeof(Real) == 0);
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#else
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return boost::lexical_cast<Real>(p);
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#endif
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}
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template <class Real>
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BOOST_CONSTEXPR const char* convert_from_string(const char* p, const mpl::true_&) BOOST_NOEXCEPT
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{
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return p;
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}
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template <class Real>
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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))
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{
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return convert_from_string<Real>(p, boost::is_constructible<Real, const char*>());
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}
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} // namespace tools
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} // namespace math
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} // namespace boost
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#endif // BOOST_MATH_TOOLS_CONVERT_FROM_STRING_INCLUDED
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