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pull destroy_range and uninitialized_copy up to the
SmallVectorTemplateBase class, which allows us to statically dispatch on isPodLike instead of dynamically. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@91523 91177308-0d34-0410-b5e6-96231b3b80d8
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@ -157,19 +157,47 @@ public:
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}
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};
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/// SmallVectorTemplateBase<isPodLike = false> - This is where we put method
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/// implementations that are designed to work with non-POD-like T's.
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template <typename T, bool isPodLike>
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class SmallVectorTemplateBase : public SmallVectorTemplateCommon<T> {
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public:
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SmallVectorTemplateBase(size_t Size) : SmallVectorTemplateCommon<T>(Size) {}
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static void destroy_range(T *S, T *E) {
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while (S != E) {
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--E;
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E->~T();
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}
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}
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/// uninitialized_copy - Copy the range [I, E) onto the uninitialized memory
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/// starting with "Dest", constructing elements into it as needed.
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template<typename It1, typename It2>
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static void uninitialized_copy(It1 I, It1 E, It2 Dest) {
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std::uninitialized_copy(I, E, Dest);
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}
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};
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/// SmallVectorTemplateBase<isPodLike = true> - This is where we put method
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/// implementations that are designed to work with POD-like T's.
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template <typename T>
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class SmallVectorTemplateBase<T, true> : public SmallVectorTemplateCommon<T> {
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public:
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SmallVectorTemplateBase(size_t Size) : SmallVectorTemplateCommon<T>(Size) {}
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// No need to do a destroy loop for POD's.
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static void destroy_range(T *S, T *E) {}
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/// uninitialized_copy - Copy the range [I, E) onto the uninitialized memory
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/// starting with "Dest", constructing elements into it as needed.
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template<typename It1, typename It2>
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static void uninitialized_copy(It1 I, It1 E, It2 Dest) {
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// Use memcpy for PODs: std::uninitialized_copy optimizes to memmove, memcpy
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// is better.
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memcpy(&*Dest, &*I, (E-I)*sizeof(T));
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}
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};
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@ -178,11 +206,10 @@ public:
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/// template parameter.
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template <typename T>
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class SmallVectorImpl : public SmallVectorTemplateBase<T, isPodLike<T>::value> {
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typedef SmallVectorTemplateBase<T, isPodLike<T>::value > SuperClass;
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public:
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typedef typename SmallVectorTemplateBase<T, isPodLike<T>::value >::iterator
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iterator;
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typedef typename SmallVectorTemplateBase<T, isPodLike<T>::value >::size_type
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size_type;
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typedef typename SuperClass::iterator iterator;
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typedef typename SuperClass::size_type size_type;
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// Default ctor - Initialize to empty.
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explicit SmallVectorImpl(unsigned N)
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@ -469,27 +496,6 @@ private:
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for (; S != E; ++S)
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new (S) T(Elt);
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}
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static void destroy_range(T *S, T *E) {
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// No need to do a destroy loop for POD's.
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if (isPodLike<T>::value) return;
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while (S != E) {
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--E;
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E->~T();
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}
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}
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/// uninitialized_copy - Copy the range [I, E) onto the uninitialized memory
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/// starting with "Dest", constructing elements into it as needed.
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template<typename It1, typename It2>
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static void uninitialized_copy(It1 I, It1 E, It2 Dest) {
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// Use memcpy for PODs: std::uninitialized_copy optimizes to memmove.
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if (isPodLike<T>::value)
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memcpy(&*Dest, &*I, (E-I)*sizeof(T));
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else
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std::uninitialized_copy(I, E, Dest);
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}
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};
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