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https://github.com/carbon-language/carbon-lang.git
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Jon Meow
90f04700e2
With this, only main.cpp instantiates an arena. Maybe we'll want to split that up more later (e.g., so that the runtime interpreter uses its own arena), but given the intent to have type-checking update the AST, I thought this was a reasonable approach for now in order to avoid ownership complexities. Fixes #769
50 lines
1.2 KiB
C++
50 lines
1.2 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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friend auto operator==(Ptr lhs, Ptr rhs) { return lhs.ptr == rhs.ptr; }
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friend auto operator!=(Ptr lhs, Ptr rhs) { return lhs.ptr != rhs.ptr; }
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private:
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T* ptr;
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};
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template <typename T>
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auto PtrTo(T& obj) -> Ptr<T> {
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return Ptr<T>(&obj);
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}
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} // namespace Carbon
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#endif // EXECUTABLE_SEMANTICS_COMMON_PTR_H_
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