f58c3774d1
Presumably the intention here is to attempt to optimize memory by not storing what is not needed. However, all keys need to be tracked anyway to implement initialization tracking, and this special case gets in the way of simplifying the implementation of that. This doesn't change any observable effects because values set to 0 are considered not to exist by the cmDefinitions API.
85 lines
2.6 KiB
C++
85 lines
2.6 KiB
C++
/*============================================================================
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CMake - Cross Platform Makefile Generator
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Copyright 2000-2009 Kitware, Inc., Insight Software Consortium
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Distributed under the OSI-approved BSD License (the "License");
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see accompanying file Copyright.txt for details.
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This software is distributed WITHOUT ANY WARRANTY; without even the
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implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
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See the License for more information.
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============================================================================*/
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#ifndef cmDefinitions_h
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#define cmDefinitions_h
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#include "cmStandardIncludes.h"
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#if defined(CMAKE_BUILD_WITH_CMAKE)
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#ifdef CMake_HAVE_CXX11_UNORDERED_MAP
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#include <unordered_map>
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#else
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#include "cmsys/hash_map.hxx"
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#endif
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#endif
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#include <list>
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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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typedef std::list<cmDefinitions>::reverse_iterator StackIter;
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typedef std::list<cmDefinitions>::const_reverse_iterator StackConstIter;
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public:
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static const char* Get(const std::string& key,
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StackIter begin, StackIter end);
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static void Raise(const std::string& key, StackIter begin, StackIter end);
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/** Set (or unset if null) a value associated with a key. */
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void Set(const std::string& key, const char* value);
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/** Get the set of all local keys. */
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std::vector<std::string> LocalKeys() const;
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static std::vector<std::string> ClosureKeys(StackConstIter begin,
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StackConstIter end);
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static cmDefinitions MakeClosure(StackConstIter begin, StackConstIter end);
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private:
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// String with existence boolean.
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struct Def: public std::string
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{
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private:
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typedef std::string std_string;
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public:
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Def(): std_string(), Exists(false) {}
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Def(const char* v): std_string(v?v:""), Exists(v?true:false) {}
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Def(const std_string& v): std_string(v), Exists(true) {}
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Def(Def const& d): std_string(d), Exists(d.Exists) {}
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bool Exists;
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};
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static Def NoDef;
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#if defined(CMAKE_BUILD_WITH_CMAKE)
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#ifdef CMake_HAVE_CXX11_UNORDERED_MAP
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typedef std::unordered_map<std::string, Def> MapType;
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#else
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typedef cmsys::hash_map<std::string, Def> MapType;
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#endif
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#else
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typedef std::map<std::string, Def> MapType;
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#endif
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MapType Map;
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static Def const& GetInternal(const std::string& key,
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StackIter begin, StackIter end, bool raise);
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};
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#endif
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