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author | John McCall <rjmccall@apple.com> | 2010-08-25 23:11:24 +0000 |
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committer | John McCall <rjmccall@apple.com> | 2010-08-25 23:11:24 +0000 |
commit | 5b5f7260a0f0da9a2057245fd42a6b196ccec33d (patch) | |
tree | 1d0d0a7c2c31287159d177f827866fbb7163440e | |
parent | cd11e9db35cf4817869ea46ba736f133a9700b28 (diff) | |
download | llvm-5b5f7260a0f0da9a2057245fd42a6b196ccec33d.tar.gz llvm-5b5f7260a0f0da9a2057245fd42a6b196ccec33d.tar.bz2 llvm-5b5f7260a0f0da9a2057245fd42a6b196ccec33d.tar.xz |
Provide an explicit specialization of SmallVector at N=0 which does
not require its type argument to be complete if no members are
actually used.
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@112106 91177308-0d34-0410-b5e6-96231b3b80d8
-rw-r--r-- | include/llvm/ADT/SmallVector.h | 33 |
1 files changed, 33 insertions, 0 deletions
diff --git a/include/llvm/ADT/SmallVector.h b/include/llvm/ADT/SmallVector.h index fa61d207bd..3be1787bc3 100644 --- a/include/llvm/ADT/SmallVector.h +++ b/include/llvm/ADT/SmallVector.h @@ -707,6 +707,39 @@ public: }; +/// Specialize SmallVector at N=0. This specialization guarantees +/// that it can be instantiated at an incomplete T if none of its +/// members are required. +template <typename T> +class SmallVector<T,0> : public SmallVectorImpl<T> { +public: + SmallVector() : SmallVectorImpl<T>(0) { + } + + explicit SmallVector(unsigned Size, const T &Value = T()) + : SmallVectorImpl<T>(0) { + this->reserve(Size); + while (Size--) + this->push_back(Value); + } + + template<typename ItTy> + SmallVector(ItTy S, ItTy E) : SmallVectorImpl<T>(0) { + this->append(S, E); + } + + SmallVector(const SmallVector &RHS) : SmallVectorImpl<T>(0) { + if (!RHS.empty()) + SmallVectorImpl<T>::operator=(RHS); + } + + const SmallVector &operator=(const SmallVector &RHS) { + SmallVectorImpl<T>::operator=(RHS); + return *this; + } + +}; + } // End llvm namespace namespace std { |