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42 lines
1.0 KiB
C++
42 lines
1.0 KiB
C++
// Part of the Carbon Language project, under the Apache License v2.0 with LLVM
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// Exceptions. See /LICENSE for license information.
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// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
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#ifndef EXECUTABLE_SEMANTICS_COMMON_PTR_H_
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#define EXECUTABLE_SEMANTICS_COMMON_PTR_H_
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#include <memory>
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#include <vector>
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#include "common/check.h"
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namespace Carbon {
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// A non-nullable pointer. Written as `Ptr<T>` instead of `T*`.
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template <typename T>
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class Ptr {
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public:
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explicit Ptr(T* ptr) : ptr(ptr) { CHECK(ptr != nullptr); }
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template <typename OtherT,
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std::enable_if_t<std::is_convertible_v<OtherT*, T*>>* = nullptr>
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Ptr(Ptr<OtherT> other) : ptr(other.Get()) {}
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Ptr(std::nullptr_t) = delete;
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Ptr(const Ptr& other) = default;
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Ptr& operator=(const Ptr& rhs) = default;
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auto operator*() const -> T& { return *ptr; }
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auto operator->() const -> T* { return ptr; }
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T* Get() const { return ptr; }
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private:
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T* ptr;
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};
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} // namespace Carbon
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#endif // EXECUTABLE_SEMANTICS_COMMON_PTR_H_
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