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pull destroy_range and uninitialized_copy up to the

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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
This commit is contained in:
Chris Lattner 2009-12-16 08:09:23 +00:00
parent e6e55d7959
commit 2676f18312
1 changed files with 32 additions and 26 deletions
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58
include/llvm/ADT/SmallVector.h
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@ -157,19 +157,47 @@ public:
}
};
/// SmallVectorTemplateBase<isPodLike = false> - This is where we put method
/// implementations that are designed to work with non-POD-like T's.
template <typename T, bool isPodLike>
class SmallVectorTemplateBase : public SmallVectorTemplateCommon<T> {
public:
SmallVectorTemplateBase(size_t Size) : SmallVectorTemplateCommon<T>(Size) {}
static void destroy_range(T *S, T *E) {
while (S != E) {
--E;
E->~T();
}
}
/// uninitialized_copy - Copy the range [I, E) onto the uninitialized memory
/// starting with "Dest", constructing elements into it as needed.
template<typename It1, typename It2>
static void uninitialized_copy(It1 I, It1 E, It2 Dest) {
std::uninitialized_copy(I, E, Dest);
}
};
/// SmallVectorTemplateBase<isPodLike = true> - This is where we put method
/// implementations that are designed to work with POD-like T's.
template <typename T>
class SmallVectorTemplateBase<T, true> : public SmallVectorTemplateCommon<T> {
public:
SmallVectorTemplateBase(size_t Size) : SmallVectorTemplateCommon<T>(Size) {}
// No need to do a destroy loop for POD's.
static void destroy_range(T *S, T *E) {}
/// uninitialized_copy - Copy the range [I, E) onto the uninitialized memory
/// starting with "Dest", constructing elements into it as needed.
template<typename It1, typename It2>
static void uninitialized_copy(It1 I, It1 E, It2 Dest) {
// Use memcpy for PODs: std::uninitialized_copy optimizes to memmove, memcpy
// is better.
memcpy(&*Dest, &*I, (E-I)*sizeof(T));
}
};
@ -178,11 +206,10 @@ public:
/// template parameter.
template <typename T>
class SmallVectorImpl : public SmallVectorTemplateBase<T, isPodLike<T>::value> {
typedef SmallVectorTemplateBase<T, isPodLike<T>::value > SuperClass;
public:
typedef typename SmallVectorTemplateBase<T, isPodLike<T>::value >::iterator
iterator;
typedef typename SmallVectorTemplateBase<T, isPodLike<T>::value >::size_type
size_type;
typedef typename SuperClass::iterator iterator;
typedef typename SuperClass::size_type size_type;
// Default ctor - Initialize to empty.
explicit SmallVectorImpl(unsigned N)
@ -469,27 +496,6 @@ private:
for (; S != E; ++S)
new (S) T(Elt);
}
static void destroy_range(T *S, T *E) {
// No need to do a destroy loop for POD's.
if (isPodLike<T>::value) return;
while (S != E) {
--E;
E->~T();
}
}
/// uninitialized_copy - Copy the range [I, E) onto the uninitialized memory
/// starting with "Dest", constructing elements into it as needed.
template<typename It1, typename It2>
static void uninitialized_copy(It1 I, It1 E, It2 Dest) {
// Use memcpy for PODs: std::uninitialized_copy optimizes to memmove.
if (isPodLike<T>::value)
memcpy(&*Dest, &*I, (E-I)*sizeof(T));
else
std::uninitialized_copy(I, E, Dest);
}
};