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1 | // Copyright John Maddock 2016. |
2 | // Use, modification and distribution are subject to the | |
3 | // Boost Software License, Version 1.0. (See accompanying file | |
4 | // LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt) | |
5 | ||
6 | #ifndef BOOST_MATH_TOOLS_CONVERT_FROM_STRING_INCLUDED | |
7 | #define BOOST_MATH_TOOLS_CONVERT_FROM_STRING_INCLUDED | |
8 | ||
9 | #ifdef _MSC_VER | |
10 | #pragma once | |
11 | #endif | |
12 | ||
13 | #include <boost/type_traits/is_constructible.hpp> | |
14 | #include <boost/type_traits/conditional.hpp> | |
15 | #include <boost/lexical_cast.hpp> | |
16 | ||
17 | namespace boost{ namespace math{ namespace tools{ | |
18 | ||
19 | template <class T> | |
20 | struct convert_from_string_result | |
21 | { | |
22 | typedef typename boost::conditional<boost::is_constructible<T, const char*>::value, const char*, T>::type type; | |
23 | }; | |
24 | ||
25 | template <class Real> | |
26 | Real convert_from_string(const char* p, const mpl::false_&) | |
27 | { | |
28 | #ifdef BOOST_MATH_NO_LEXICAL_CAST | |
29 | // This function should not compile, we don't have the necesary functionality to support it: | |
30 | BOOST_STATIC_ASSERT(sizeof(Real) == 0); | |
31 | #else | |
32 | return boost::lexical_cast<Real>(p); | |
33 | #endif | |
34 | } | |
35 | template <class Real> | |
36 | BOOST_CONSTEXPR const char* convert_from_string(const char* p, const mpl::true_&) BOOST_NOEXCEPT | |
37 | { | |
38 | return p; | |
39 | } | |
40 | template <class Real> | |
41 | 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)) | |
42 | { | |
43 | return convert_from_string<Real>(p, boost::is_constructible<Real, const char*>()); | |
44 | } | |
45 | ||
46 | } // namespace tools | |
47 | } // namespace math | |
48 | } // namespace boost | |
49 | ||
50 | #endif // BOOST_MATH_TOOLS_CONVERT_FROM_STRING_INCLUDED | |
51 |