Danny Robson
f6056153e3
This places, at long last, the core library code into the same namespace as the extended library code.
106 lines
2.7 KiB
C++
106 lines
2.7 KiB
C++
/*
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* This Source Code Form is subject to the terms of the Mozilla Public
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* License, v. 2.0. If a copy of the MPL was not distributed with this
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* file, You can obtain one at http://mozilla.org/MPL/2.0/.
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*
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* Copyright 2017 Danny Robson <danny@nerdcruft.net>
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*/
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#include "parse.hpp"
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#include "cast.hpp"
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#include <cstdlib>
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#include <stdexcept>
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using cruft::parse;
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///////////////////////////////////////////////////////////////////////////////
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template <typename T> struct c_traits;
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template <> struct c_traits<long> { static constexpr auto func = strtol; };
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template <> struct c_traits<long long> { static constexpr auto func = strtoll; };
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template <> struct c_traits<unsigned long> { static constexpr auto func = strtoul; };
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template <> struct c_traits<unsigned long long> { static constexpr auto func = strtoull; };
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template <> struct c_traits<float> { static constexpr auto func = strtof; };
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template <> struct c_traits<double> { static constexpr auto func = strtod; };
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template <> struct c_traits<long double> { static constexpr auto func = strtold; };
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//-----------------------------------------------------------------------------
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template <typename T>
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T
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c_iparse (const char *first, const char *last)
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{
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auto tail = const_cast<char *> (last);
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auto val = c_traits<T>::func (first, &tail, 0);
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if (tail != last)
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throw std::invalid_argument ("unable to parse");
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return val;
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}
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//-----------------------------------------------------------------------------
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template <typename T>
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T
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c_fparse (const char *first, const char *last)
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{
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auto tail = const_cast<char *> (last);
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auto val = c_traits<T>::func (first, &tail);
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if (tail != last)
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throw std::invalid_argument ("unable to parse");
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return val;
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}
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///////////////////////////////////////////////////////////////////////////////
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#define C_PARSE(T, KLASS) \
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template <> \
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T \
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cruft::parse<T> (cruft::view<const char *> str) \
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{ \
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return c_ ## KLASS ## parse<T> (std::cbegin (str), std::cend (str)); \
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}
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//-----------------------------------------------------------------------------
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C_PARSE(long, i)
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C_PARSE(long long, i)
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C_PARSE(unsigned long, i)
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C_PARSE(unsigned long long, i)
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C_PARSE(float, f)
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C_PARSE(double, f)
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C_PARSE(long double, f)
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template <>
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int
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cruft::parse<int> (cruft::view<const char*> str)
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{
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auto intermediate = cruft::parse<long> (str);
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return cruft::cast::lossless<int> (intermediate);
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}
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template <>
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unsigned
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cruft::parse<unsigned> (cruft::view<const char*> str)
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{
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return cruft::cast::narrow<unsigned> (parse<unsigned long> (str));
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}
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template <>
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unsigned short
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cruft::parse<unsigned short> (cruft::view<const char*> str)
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{
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return cruft::cast::narrow<unsigned short> (parse<unsigned long> (str));
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}
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