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Bug 1271022 - add Vector::podResizeToFit (r=njn)

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MozReview-Commit-ID: 9HTY6O9GY4U

--HG--
extra : rebase_source : 55c226d23bd6dbb7b3bb21b356e64ae7499d3f0a
This commit is contained in:
Luke Wagner 2016-05-09 08:59:10 -05:00
parent b11e2e12ee
commit df166c688f
1 changed files with 30 additions and 0 deletions
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30
mfbt/Vector.h
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@ -229,6 +229,20 @@ struct VectorImpl<T, N, AP, true>
aV.mCapacity = aNewCap;
return true;
}
static inline void
podResizeToFit(Vector<T, N, AP>& aV)
{
if (aV.usingInlineStorage() || aV.mLength == aV.mCapacity) {
return;
}
T* newbuf = aV.template pod_realloc<T>(aV.mBegin, aV.mCapacity, aV.mLength);
if (MOZ_UNLIKELY(!newbuf)) {
return;
}
aV.mBegin = newbuf;
aV.mCapacity = aV.mLength;
}
};
// A struct for TestVector.cpp to access private internal fields.
@ -559,6 +573,13 @@ public:
/** Clears and releases any heap-allocated storage. */
void clearAndFree();
/**
* Calls the AllocPolicy's pod_realloc to release excess capacity. Since
* realloc is only safe on PODs, this method fails to compile if IsPod<T>
* is false.
*/
void podResizeToFit();
/**
* If true, appending |aNeeded| elements won't reallocate elements storage.
* This *doesn't* mean that infallibleAppend may be used! You still must
@ -1103,6 +1124,15 @@ Vector<T, N, AP>::clearAndFree()
#endif
}
template<typename T, size_t N, class AP>
inline void
Vector<T, N, AP>::podResizeToFit()
{
// This function is only defined if IsPod is true and will fail to compile
// otherwise.
Impl::podResizeToFit(*this);
}
template<typename T, size_t N, class AP>
inline bool
Vector<T, N, AP>::canAppendWithoutRealloc(size_t aNeeded) const