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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
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file Copyright.txt or https://cmake.org/licensing for details. */
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#include <cassert>
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#include <memory>
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#include <utility>
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template <typename T, typename Stack>
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struct cmConstStack<T, Stack>::Entry
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{
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Entry(std::shared_ptr<Entry const> parent, T value)
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: Value(std::move(value))
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, Parent(std::move(parent))
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{
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}
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T Value;
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std::shared_ptr<Entry const> Parent;
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};
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template <typename T, typename Stack>
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cmConstStack<T, Stack>::cmConstStack() = default;
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template <typename T, typename Stack>
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Stack cmConstStack<T, Stack>::Push(T value) const
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{
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return Stack(this->TopEntry, std::move(value));
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}
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template <typename T, typename Stack>
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Stack cmConstStack<T, Stack>::Pop() const
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{
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assert(this->TopEntry);
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return Stack(this->TopEntry->Parent);
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}
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template <typename T, typename Stack>
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T const& cmConstStack<T, Stack>::Top() const
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{
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assert(this->TopEntry);
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return this->TopEntry->Value;
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}
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template <typename T, typename Stack>
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bool cmConstStack<T, Stack>::Empty() const
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{
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return !this->TopEntry;
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}
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template <typename T, typename Stack>
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cmConstStack<T, Stack>::cmConstStack(std::shared_ptr<Entry const> parent,
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T value)
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: TopEntry(
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std::make_shared<Entry const>(std::move(parent), std::move(value)))
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{
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}
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template <typename T, typename Stack>
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cmConstStack<T, Stack>::cmConstStack(std::shared_ptr<Entry const> top)
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: TopEntry(std::move(top))
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{
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}
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