https://github.com/Kitware/CMake
Tip revision: 9306a5ab28af6bb6dc2b933339ccc66764f44b12 authored by Brad King on 20 July 2022, 13:33:55 UTC
CMake 3.24.0-rc4
CMake 3.24.0-rc4
Tip revision: 9306a5a
cmConstStack.h
/* Distributed under the OSI-approved BSD 3-Clause License. See accompanying
file Copyright.txt or https://cmake.org/licensing for details. */
#pragma once
#include "cmConfigure.h" // IWYU pragma: keep
#include <memory>
/** Base class template for CRTP to represent a stack of constant values.
Provide value semantics, but use efficient reference-counting underneath
to avoid copies. */
template <typename T, typename Stack>
class cmConstStack
{
struct Entry;
std::shared_ptr<Entry const> TopEntry;
public:
/** Default-construct an empty stack. */
cmConstStack();
/** Get a stack with the given call context added to the top. */
Stack Push(T value) const;
/** Get a stack with the top level removed.
May not be called until after a matching Push. */
Stack Pop() const;
/** Get the value at the top of the stack.
This may be called only if Empty() would return false. */
T const& Top() const;
/** Return true if this stack is empty. */
bool Empty() const;
protected:
cmConstStack(std::shared_ptr<Entry const> parent, T value);
cmConstStack(std::shared_ptr<Entry const> top);
};