fmt_buffer.hpp

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// SPDX-License-Identifier: BSL-1.0
// SPDX-FileCopyrightText: Copyright (C) 2023 Tobias Hienzsch
 
#ifndef TETL_FORMAT_FMT_BUFFER_HPP
#define TETL_FORMAT_FMT_BUFFER_HPP
 
#include <etl/_format/format_arg_store.hpp>
#include <etl/_memory/addressof.hpp>
#include <etl/_utility/forward.hpp>
 
namespace etl::detail {
 
template <typename CharType>
struct fmt_buffer {
    using value_type = CharType;
 
    template <typename It>
    fmt_buffer(It out) noexcept
        : _it{addressof(out)}
        , _pushBack{[](void* ptr, CharType ch) { (*static_cast<It*>(ptr)) = ch; }}
    {
    }
 
    auto push_back(CharType ch) -> void
    {
        (_pushBack)(_it, ch);
    }
 
private:
    using push_back_func_t = void (*)(void*, CharType);
 
    void* _it;
    push_back_func_t _pushBack;
};
 
} // namespace etl::detail
 
#endif // TETL_FORMAT_FMT_BUFFER_HPP