106 lines
2.9 KiB
C++
106 lines
2.9 KiB
C++
/*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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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 util::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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util::parse<T> (util::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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util::parse<int> (util::view<const char*> str)
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{
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auto intermediate = util::parse<long> (str);
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return util::cast::lossless<int> (intermediate);
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}
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template <>
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unsigned
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util::parse<unsigned> (util::view<const char*> str)
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{
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return util::cast::narrow<unsigned> (parse<unsigned long> (str));
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}
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