flat_map.hpp

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// Copyright 2026 Slick Quant
// SPDX-License-Identifier: MIT
 
#pragma once
 
#include <slick/orderbook/config.hpp>
#include <version>
 
// Check for C++23 flat_map support
#if defined(__cpp_lib_flat_map)
    #include <flat_map>
    #define SLICK_HAS_FLAT_MAP 1
#else
    #include <map>
    #define SLICK_HAS_FLAT_MAP 0
#endif
 
SLICK_DETAIL_NAMESPACE_BEGIN
 
#if SLICK_HAS_FLAT_MAP
template<typename Key, typename Value, typename Compare = std::less<Key>>
using FlatMap = std::flat_map<Key, Value, Compare>;
#else
template<typename Key, typename Value, typename Compare = std::less<Key>>
using FlatMap = std::map<Key, Value, Compare>;
#endif
 
SLICK_DETAIL_NAMESPACE_END