nim-ffi/ffi/codegen/templates/cpp/header_prelude.hpp.tpl

#pragma once
// Generated bindings require C++20 — the event-listener API uses
// std::span<const std::uint8_t> for the wildcard callback.
// MSVC keeps __cplusplus at 199711L unless /Zc:__cplusplus is passed,
// so consult _MSVC_LANG when present (it always reflects the active
// /std:c++XX level).
#if defined(_MSVC_LANG)
#  if _MSVC_LANG < 202002L
#    error "nim-ffi generated headers require C++20 or later (use /std:c++20)"
#  endif
#elif !defined(__cplusplus) || __cplusplus < 202002L
#  error "nim-ffi generated headers require C++20 or later"
#endif
#include <string>
#include <cstdint>
#include <chrono>
#include <stdexcept>
#include <mutex>
#include <condition_variable>
#include <memory>
#include <functional>
#include <future>
#include <vector>
#include <optional>
#include <type_traits>
#include <cstring>
extern "C" {
#include <tinycbor/cbor.h>
}