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https://github.com/eledio-devices/thirdparty-ArduinoJson.git
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80 lines
1.9 KiB
C++
80 lines
1.9 KiB
C++
// ArduinoJson - https://arduinojson.org
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// Copyright © 2014-2023, Benoit BLANCHON
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// MIT License
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#pragma once
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#include <ArduinoJson/Strings/Adapters/RamString.hpp>
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#include <ArduinoJson/Strings/StringAdapter.hpp>
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ARDUINOJSON_BEGIN_PRIVATE_NAMESPACE
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namespace string_traits_impl {
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// const char* c_str() const
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// - String
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// - std::string
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template <class T, class = void>
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struct has_cstr : false_type {};
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template <class T>
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struct has_cstr<T,
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typename enable_if<is_same<decltype(declval<const T>().c_str()),
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const char*>::value>::type>
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: true_type {};
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// const char* data() const
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// - std::string
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// - std::string_view
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// - etl::string
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template <class T, class = void>
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struct has_data : false_type {};
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template <class T>
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struct has_data<T,
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typename enable_if<is_same<decltype(declval<const T>().data()),
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const char*>::value>::type>
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: true_type {};
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// size_t length() const
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// - String
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template <class T, class = void>
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struct has_length : false_type {};
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template <class T>
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struct has_length<
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T, typename enable_if<
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is_same<decltype(declval<const T>().length()), size_t>::value>::type>
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: true_type {};
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// size_t size() const
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// - std::string
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// - std::string_view
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// - etl::string
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template <class T, class = void>
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struct has_size : false_type {};
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template <class T>
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struct has_size<
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T, typename enable_if<
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is_same<decltype(declval<const T>().size()), size_t>::value>::type>
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: true_type {};
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} // namespace string_traits_impl
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template <typename T>
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struct string_traits {
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enum {
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has_cstr = string_traits_impl::has_cstr<T>::value,
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has_length = string_traits_impl::has_length<T>::value,
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has_data = string_traits_impl::has_data<T>::value,
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has_size = string_traits_impl::has_size<T>::value
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};
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};
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ARDUINOJSON_END_PRIVATE_NAMESPACE
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