bdca8b01d2
#pragma once is a widely supported compiler pragma, even though it is not part of the C++ standard. Many of the issues keeping #pragma once from being standardized (distributed filesystems, build farms, hard links, etc.) do not apply to CMake - it is easy to build CMake on a single machine. CMake also does not install any header files which can be consumed by other projects (though cmCPluginAPI.h has been deliberately omitted from this conversion in case anyone is still using it.) Finally, #pragma once has been required to build CMake since at least August 2017 (7f29bbe6enabled server mode unconditionally, which had been using #pragma once since September 2016 (b13d3e0d)). The fact that we now require C++11 filters out old compilers, and it is unlikely that there is a compiler which supports C++11 but does not support #pragma once.
69 lines
1.7 KiB
C++
69 lines
1.7 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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#pragma once
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#include "cmConfigure.h" // IWYU pragma: keep
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#include <functional>
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#include <string>
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#include <unordered_map>
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#include <vector>
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#include <cm/string_view>
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#include "cmLinkedTree.h"
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#include "cmString.hxx"
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/** \class cmDefinitions
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* \brief Store a scope of variable definitions for CMake language.
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*
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* This stores the state of variable definitions (set or unset) for
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* one scope. Sets are always local. Gets search parent scopes
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* transitively and save results locally.
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*/
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class cmDefinitions
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{
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using StackIter = cmLinkedTree<cmDefinitions>::iterator;
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public:
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// -- Static member functions
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static const std::string* Get(const std::string& key, StackIter begin,
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StackIter end);
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static void Raise(const std::string& key, StackIter begin, StackIter end);
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static bool HasKey(const std::string& key, StackIter begin, StackIter end);
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static std::vector<std::string> ClosureKeys(StackIter begin, StackIter end);
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static cmDefinitions MakeClosure(StackIter begin, StackIter end);
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// -- Member functions
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/** Set a value associated with a key. */
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void Set(const std::string& key, cm::string_view value);
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/** Unset a definition. */
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void Unset(const std::string& key);
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private:
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/** String with existence boolean. */
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struct Def
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{
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public:
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Def() = default;
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Def(cm::string_view value)
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: Value(value)
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{
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}
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cm::String Value;
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};
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static Def NoDef;
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std::unordered_map<cm::String, Def> Map;
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static Def const& GetInternal(const std::string& key, StackIter begin,
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StackIter end, bool raise);
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};
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