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Add a new C++11 compatibility macro, LLVM_LVALUE_FUNCTION.
This expands to '&', and is intended to be used when an /optional/ rvalue override is available. Before: void foo() const { ... } After: void foo() const LLVM_LVALUE_FUNCTION { ... } void foo() && { ... } This is used to allow moving the contents of an Optional. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@168963 91177308-0d34-0410-b5e6-96231b3b80d8
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@ -48,12 +48,17 @@ public:
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}
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const T* getPointer() const { assert(hasVal); return &x; }
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const T& getValue() const { assert(hasVal); return x; }
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const T& getValue() const LLVM_LVALUE_FUNCTION { assert(hasVal); return x; }
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operator bool() const { return hasVal; }
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bool hasValue() const { return hasVal; }
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const T* operator->() const { return getPointer(); }
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const T& operator*() const { assert(hasVal); return x; }
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const T& operator*() const LLVM_LVALUE_FUNCTION { assert(hasVal); return x; }
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#if LLVM_USE_RVALUE_REFERENCES
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T&& getValue() && { assert(hasVal); return std::move(x); }
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T&& operator*() && { assert(hasVal); return std::move(x); }
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#endif
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};
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template<typename T> struct simplify_type;
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@ -38,6 +38,16 @@
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#define llvm_move(value) (value)
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#endif
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/// Expands to '&' if r-value references are supported.
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///
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/// This can be used to provide l-value/r-value overrides of member functions.
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/// The r-value override should be guarded by LLVM_USE_RVALUE_REFERENCES
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#if LLVM_USE_RVALUE_REFERENCES
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#define LLVM_LVALUE_FUNCTION &
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#else
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#define LLVM_LVALUE_FUNCTION
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#endif
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/// LLVM_DELETED_FUNCTION - Expands to = delete if the compiler supports it.
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/// Use to mark functions as uncallable. Member functions with this should
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/// be declared private so that some behavior is kept in C++03 mode.
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