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Add a T&& constructor to llvm::Optional.

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This allows llvm::Optional to be used with movable-but-not-copyable types.
While LLVM itself is still C++03, there's no reason why tools built on
top of it can't use C++11 features.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@166241 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Jordan Rose 2012-10-18 22:22:55 +00:00
parent 82c5180ed1
commit 9d9a6128fe
1 changed files with 9 additions and 0 deletions
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9
include/llvm/ADT/Optional.h
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@ -16,8 +16,13 @@
#ifndef LLVM_ADT_OPTIONAL
#define LLVM_ADT_OPTIONAL
#include "LLVM/Support/Compiler.h"
#include <cassert>
#if LLVM_USE_RVALUE_REFERENCES
#include <utility>
#endif
namespace llvm {
template<typename T>
@ -28,6 +33,10 @@ public:
explicit Optional() : x(), hasVal(false) {}
Optional(const T &y) : x(y), hasVal(true) {}
#if LLVM_USE_RVALUE_REFERENCES
Optional(T &&y) : x(std::forward<T>(y)), hasVal(true) {}
#endif
static inline Optional create(const T* y) {
return y ? Optional(*y) : Optional();
}