53 lines
1.3 KiB
C
53 lines
1.3 KiB
C
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#ifndef TMP_STRINGVIEW_H
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#define TMP_STRINGVIEW_H
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/**
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* @file tmp/stringview.h"
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* @brief partial implementation of C++17 std::string_view
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*
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* see: https://stackoverflow.com/questions/81870/is-it-possible-to-print-a-variables-type-in-standard-c
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* see: https://stackoverflow.com/a/20170989
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* string_view is from "static_string" class
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* to be replaced by std::string_view as soon as possible
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*
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* Adapted, minimal C++ version supported now C++11
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*/
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#include <stdexcept>
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namespace tmp {
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class string_view {
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char const* const _p;
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std::size_t const _sz;
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public:
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using const_iterator = char const*;
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template<std::size_t N>
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constexpr string_view(char const(&a)[N]) noexcept: _p(a), _sz(N-1) {}
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constexpr string_view(char const*p, std::size_t N) noexcept: _p(p), _sz(N) {}
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constexpr char const*data() const noexcept {return _p;}
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constexpr std::size_t size() const noexcept {return _sz;}
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constexpr const_iterator begin() const noexcept {return _p;}
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constexpr const_iterator end() const noexcept {return _p + _sz;}
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constexpr char operator[](std::size_t n) const {
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return n < _sz? _p[n] : throw std::out_of_range("string_view");
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}
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explicit operator std::string() const { return {_p, _sz}; }
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};
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template<typename Ostream>
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inline Ostream&operator<<(Ostream &os, string_view const&s) {
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os.write(s.data(), s.size());
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return os;
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}
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}
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#endif
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