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// Copyright 2024 The Chromium Authors
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#ifndef BASE_NOTIMPLEMENTED_H_
#define BASE_NOTIMPLEMENTED_H_
#include "base/check.h"
#include "base/dcheck_is_on.h"
// The NOTIMPLEMENTED() macro annotates codepaths which have not been
// implemented yet. If output spam is a serious concern,
// NOTIMPLEMENTED_LOG_ONCE() can be used.
#if DCHECK_IS_ON()
#define NOTIMPLEMENTED() \
::logging::CheckError::NotImplemented(__PRETTY_FUNCTION__)
// The lambda returns false the first time it is run, and true every other time.
// Note that the `static const bool call_once` trickery is used for thread
// safety (C++11 guarantees that `call_once` is only initialized once, no UB
// even if two threads enter concurrently).
#define NOTIMPLEMENTED_LOG_ONCE() \
switch (0) \
case 0: \
default: \
if ([] { \
bool old_value = true; \
[[maybe_unused]] static const bool call_once = [](bool* b) { \
*b = false; \
return true; \
}(&old_value); \
return old_value; \
}()) \
; \
else \
NOTIMPLEMENTED()
// The TVOS_NOT_YET_IMPLEMENTED() macro marks code paths that have not yet been
// implemented for tvOS.
#define TVOS_NOT_YET_IMPLEMENTED() \
::logging::CheckError::NotImplemented(__PRETTY_FUNCTION__)
#else
#define NOTIMPLEMENTED() EAT_CHECK_STREAM_PARAMS()
#define NOTIMPLEMENTED_LOG_ONCE() EAT_CHECK_STREAM_PARAMS()
#define TVOS_NOT_YET_IMPLEMENTED() EAT_CHECK_STREAM_PARAMS()
#endif
#endif // BASE_NOTIMPLEMENTED_H_
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