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Make string support generic (issue #1807)

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This commit is contained in:
Benoit Blanchon
2023-03-13 12:19:05 +01:00
parent 42ae8c3037
commit c89a2025ce
10 changed files with 141 additions and 90 deletions
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79
src/ArduinoJson/Strings/StringTraits.hpp Normal file
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// ArduinoJson - https://arduinojson.org
// Copyright © 2014-2023, Benoit BLANCHON
// MIT License
#pragma once
#include <ArduinoJson/Strings/Adapters/RamString.hpp>
#include <ArduinoJson/Strings/StringAdapter.hpp>
ARDUINOJSON_BEGIN_PRIVATE_NAMESPACE
namespace string_traits_impl {
// const char* c_str() const
// - String
// - std::string
template <class T, class = void>
struct has_cstr : false_type {};
template <class T>
struct has_cstr<T,
typename enable_if<is_same<decltype(declval<const T>().c_str()),
const char*>::value>::type>
: true_type {};
// const char* data() const
// - std::string
// - std::string_view
// - etl::string
template <class T, class = void>
struct has_data : false_type {};
template <class T>
struct has_data<T,
typename enable_if<is_same<decltype(declval<const T>().data()),
const char*>::value>::type>
: true_type {};
// size_t length() const
// - String
template <class T, class = void>
struct has_length : false_type {};
template <class T>
struct has_length<
T, typename enable_if<
is_same<decltype(declval<const T>().length()), size_t>::value>::type>
: true_type {};
// size_t size() const
// - std::string
// - std::string_view
// - etl::string
template <class T, class = void>
struct has_size : false_type {};
template <class T>
struct has_size<
T, typename enable_if<
is_same<decltype(declval<const T>().size()), size_t>::value>::type>
: true_type {};
} // namespace string_traits_impl
template <typename T>
struct string_traits {
enum {
has_cstr = string_traits_impl::has_cstr<T>::value,
has_length = string_traits_impl::has_length<T>::value,
has_data = string_traits_impl::has_data<T>::value,
has_size = string_traits_impl::has_size<T>::value
};
};
ARDUINOJSON_END_PRIVATE_NAMESPACE