forked from bblanchon/ArduinoJson
64 lines
1.4 KiB
C++
64 lines
1.4 KiB
C++
// Copyright Benoit Blanchon 2014-2017
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// MIT License
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//
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// Arduino JSON library
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// https://github.com/bblanchon/ArduinoJson
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// If you like this project, please add a star!
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#pragma once
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#if ARDUINOJSON_ENABLE_STD_STREAM
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#include <istream>
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#include "../TypeTraits/EnableIf.hpp"
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#include "../TypeTraits/IsBaseOf.hpp"
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#include "../TypeTraits/RemoveReference.hpp"
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namespace ArduinoJson {
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namespace Internals {
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struct StdStreamTraits {
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class Reader {
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std::istream& _stream;
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char _current, _next;
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public:
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Reader(std::istream& stream) : _stream(stream), _current(0), _next(0) {}
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void move() {
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_current = _next;
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_next = 0;
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}
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char current() {
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if (!_current) _current = read();
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return _current;
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}
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char next() {
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// assumes that current() has been called
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if (!_next) _next = read();
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return _next;
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}
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private:
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Reader& operator=(const Reader&); // Visual Studio C4512
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char read() {
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return _stream.eof() ? '\0' : static_cast<char>(_stream.get());
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}
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};
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};
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template <typename TStream>
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struct StringTraits<TStream,
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// match any type that is derived from std::istream:
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typename TypeTraits::EnableIf<TypeTraits::IsBaseOf<
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std::istream, typename TypeTraits::RemoveReference<
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TStream>::type>::value>::type>
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: StdStreamTraits {};
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}
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}
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#endif
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