mirror of
https://github.com/Kitware/CMake.git
synced 2025-06-09 15:38:15 +08:00
11cc728e75
This presents value semantics for a stack of constant values. Internally it shares ownership to avoid copies. Previously this was implemented by `cmListFileBacktrace` explicitly, but the approach can be re-used for other kinds of stacks.
63 lines
1.5 KiB
C++
63 lines
1.5 KiB
C++
/* Distributed under the OSI-approved BSD 3-Clause License. See accompanying
|
|
file Copyright.txt or https://cmake.org/licensing for details. */
|
|
|
|
#include <cassert>
|
|
#include <memory>
|
|
#include <utility>
|
|
|
|
template <typename T, typename Stack>
|
|
struct cmConstStack<T, Stack>::Entry
|
|
{
|
|
Entry(std::shared_ptr<Entry const> parent, T value)
|
|
: Value(std::move(value))
|
|
, Parent(std::move(parent))
|
|
{
|
|
}
|
|
|
|
T Value;
|
|
std::shared_ptr<Entry const> Parent;
|
|
};
|
|
|
|
template <typename T, typename Stack>
|
|
cmConstStack<T, Stack>::cmConstStack() = default;
|
|
|
|
template <typename T, typename Stack>
|
|
Stack cmConstStack<T, Stack>::Push(T value) const
|
|
{
|
|
return Stack(this->TopEntry, std::move(value));
|
|
}
|
|
|
|
template <typename T, typename Stack>
|
|
Stack cmConstStack<T, Stack>::Pop() const
|
|
{
|
|
assert(this->TopEntry);
|
|
return Stack(this->TopEntry->Parent);
|
|
}
|
|
|
|
template <typename T, typename Stack>
|
|
T const& cmConstStack<T, Stack>::Top() const
|
|
{
|
|
assert(this->TopEntry);
|
|
return this->TopEntry->Value;
|
|
}
|
|
|
|
template <typename T, typename Stack>
|
|
bool cmConstStack<T, Stack>::Empty() const
|
|
{
|
|
return !this->TopEntry;
|
|
}
|
|
|
|
template <typename T, typename Stack>
|
|
cmConstStack<T, Stack>::cmConstStack(std::shared_ptr<Entry const> parent,
|
|
T value)
|
|
: TopEntry(
|
|
std::make_shared<Entry const>(std::move(parent), std::move(value)))
|
|
{
|
|
}
|
|
|
|
template <typename T, typename Stack>
|
|
cmConstStack<T, Stack>::cmConstStack(std::shared_ptr<Entry const> top)
|
|
: TopEntry(std::move(top))
|
|
{
|
|
}
|