160 lines
3.6 KiB
C++
160 lines
3.6 KiB
C++
// Boost.Geometry
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// Copyright (c) 2018-2020, Oracle and/or its affiliates.
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// Contributed and/or modified by Adam Wulkiewicz, on behalf of Oracle
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// Use, modification and distribution is subject to the Boost Software License,
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// Version 1.0. (See 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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#ifndef BOOST_GEOMETRY_SRS_PROJECTIONS_STR_CAST_HPP
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#define BOOST_GEOMETRY_SRS_PROJECTIONS_STR_CAST_HPP
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#include <cstdlib>
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#include <string>
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#include <type_traits>
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#include <boost/config.hpp>
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#include <boost/geometry/core/exception.hpp>
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#include <boost/throw_exception.hpp>
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namespace boost { namespace geometry
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{
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class bad_str_cast : public geometry::exception
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{
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virtual char const* what() const throw()
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{
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return "Unable to convert from string.";
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}
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};
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#ifndef DOXYGEN_NO_DETAIL
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namespace detail
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{
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template
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<
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typename T,
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bool IsIntegral = std::is_integral<T>::value,
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bool IsSigned = std::is_signed<T>::value
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>
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struct str_cast_traits_strtox
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{
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static inline T apply(const char *str, char **str_end)
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{
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return strtod(str, str_end);
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}
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};
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template <typename T>
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struct str_cast_traits_strtox<T, true, true>
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{
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static inline T apply(const char *str, char **str_end)
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{
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return strtol(str, str_end, 0);
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}
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};
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template <typename T>
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struct str_cast_traits_strtox<T, true, false>
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{
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static inline T apply(const char *str, char **str_end)
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{
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return strtoul(str, str_end, 0);
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}
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};
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template <typename T>
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struct str_cast_traits_strtox<T, false, false>
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{
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static inline T apply(const char *str, char **str_end)
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{
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return strtod(str, str_end);
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}
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};
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// Assuming a compiler supporting r-value references
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// supports long long and strtoll, strtoull, strtof, strtold
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// If it's MSVC enable in MSVC++ 12.0 aka Visual Studio 2013
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// TODO: in MSVC-11.0 _strtoi64() intrinsic could be used
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#if !defined(BOOST_NO_CXX11_RVALUE_REFERENCES) && (!defined(_MSC_VER) || (_MSC_VER >= 1800))
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template <>
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struct str_cast_traits_strtox<long long, true, true>
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{
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static inline long long apply(const char *str, char **str_end)
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{
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return strtoll(str, str_end, 0);
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}
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};
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template <>
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struct str_cast_traits_strtox<unsigned long long, true, false>
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{
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static inline unsigned long long apply(const char *str, char **str_end)
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{
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return strtoull(str, str_end, 0);
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}
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};
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template <>
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struct str_cast_traits_strtox<float, false, false>
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{
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static inline float apply(const char *str, char **str_end)
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{
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return strtof(str, str_end);
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}
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};
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template <>
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struct str_cast_traits_strtox<long double, false, false>
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{
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static inline long double apply(const char *str, char **str_end)
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{
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return strtold(str, str_end);
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}
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};
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#endif // C++11 strtox supported
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template <typename T>
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struct str_cast_traits_generic
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{
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static inline T apply(const char *str)
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{
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char * str_end = (char*)(void*)str;
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T res = str_cast_traits_strtox
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<
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typename boost::remove_cv<T>::type
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>::apply(str, &str_end);
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if (str_end == str)
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{
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BOOST_THROW_EXCEPTION( bad_str_cast() );
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}
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return res;
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}
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};
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} // namespace detail
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#endif // DOXYGEN_NO_DETAIL
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template <typename T>
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struct str_cast_traits
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{
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template <typename String>
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static inline T apply(String const& str)
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{
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return detail::str_cast_traits_generic<T>::apply(str.c_str());
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}
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};
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template <typename T, typename String>
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inline T str_cast(String const& str)
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{
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return str_cast_traits<T>::apply(str);
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}
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}} // namespace boost::geometry
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#endif // BOOST_GEOMETRY_SRS_PROJECTIONS_STR_CAST_HPP
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