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56 lines
1.6 KiB
C++
56 lines
1.6 KiB
C++
// Copyright 2022 The Chromium Authors
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// Use of this source code is governed by a BSD-style license that can be
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// found in the LICENSE file.
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#include "base/check.h"
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#include "base/compiler_specific.h"
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#if CHECK_WILL_STREAM()
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#include "base/logging.h"
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#endif // CHECK_WILL_STREAM()
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#ifndef BASE_CHECK_DEREF_H_
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#define BASE_CHECK_DEREF_H_
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namespace logging {
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// Returns a reference to pointee of `ptr` if `ptr` is not null, or dies if
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// `ptr` is null.
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//
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// It is useful in initializers and direct assignments, where a direct `CHECK`
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// call can't be used:
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//
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// MyType& type_ref = CHECK_DEREF(MethodReturningAPointer());
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//
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// If your raw pointer is stored in a wrapped type like `unique_ptr` or
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// `raw_ptr`, you should use their `.get()` methods to get the raw pointer
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// before calling `CHECK_DEREF()`:
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//
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// MyType& type_ref = CHECK_DEREF(your_wrapped_pointer.get());
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//
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#define CHECK_DEREF(ptr) \
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::logging::CheckDeref(ptr, #ptr " != nullptr", __FILE__, __LINE__)
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template <typename T>
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[[nodiscard]] T& CheckDeref(T* ptr,
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const char* message,
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const char* file,
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int line) {
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// Note: we can't just call `CHECK_NE(ptr, nullptr)` here, as that would
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// cause the error to be reported from this header, and we want the error
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// to be reported at the file and line of the caller.
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if (ptr == nullptr) [[unlikely]] {
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#if !CHECK_WILL_STREAM()
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CheckFailure();
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#else
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// `LogMessage` will die with a fatal error in its destructor.
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LogMessage(file, line, message);
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#endif // !CHECK_WILL_STREAM()
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}
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return *ptr;
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}
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} // namespace logging
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#endif // BASE_CHECK_DEREF_H_
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