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Bug 1219238 - remove AutoArray from mozStorageSQLFunctions.cpp; r=mak

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nsAutoTArray is practically the same thing; we should just use that and
avoid code duplications.
This commit is contained in:
Nathan Froyd 2015-10-27 21:22:52 -04:00
parent 19b671058a
commit 75c7789c73
1 changed files with 5 additions and 51 deletions
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56
storage/mozStorageSQLFunctions.cpp
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@ -116,48 +116,6 @@ likeCompare(nsAString::const_iterator aPatternItr,
return aStringItr == aStringEnd;
}
/**
* This class manages a dynamic array. It can represent an array of any
* reasonable size, but if the array is "N" elements or smaller, it will be
* stored using fixed space inside the auto array itself. If the auto array
* is a local variable, this internal storage will be allocated cheaply on the
* stack, similar to nsAutoString. If a larger size is requested, the memory
* will be dynamically allocated from the heap. Since the destructor will
* free any heap-allocated memory, client code doesn't need to care where the
* memory came from.
*/
template <class T, size_t N> class AutoArray
{
public:
explicit AutoArray(size_t size)
: mBuffer(size <= N ? mAutoBuffer : new T[size])
{
}
~AutoArray()
{
if (mBuffer != mAutoBuffer)
delete[] mBuffer;
}
/**
* Return the pointer to the allocated array.
* @note If the array allocation failed, get() will return nullptr!
*
* @return the pointer to the allocated array
*/
T *get()
{
return mBuffer;
}
private:
T *mBuffer; // Points to mAutoBuffer if we can use it, heap otherwise.
T mAutoBuffer[N]; // The internal memory buffer that we use if we can.
};
/**
* Compute the Levenshtein Edit Distance between two strings.
*
@ -206,17 +164,13 @@ levenshteinDistance(const nsAString &aStringS,
// left-to-right within each row. The computation only requires that
// we be able to see the current row and the previous one.
// Allocate memory for two rows. Use AutoArray's to manage the memory
// so we don't have to explicitly free it, and so we can avoid the expense
// of memory allocations for relatively small strings.
AutoArray<int, nsAutoString::kDefaultStorageSize> row1(sLen + 1);
AutoArray<int, nsAutoString::kDefaultStorageSize> row2(sLen + 1);
// Allocate memory for two rows.
nsAutoTArray<int, nsAutoString::kDefaultStorageSize> row1;
nsAutoTArray<int, nsAutoString::kDefaultStorageSize> row2;
// Declare the raw pointers that will actually be used to access the memory.
int *prevRow = row1.get();
NS_ENSURE_TRUE(prevRow, SQLITE_NOMEM);
int *currRow = row2.get();
NS_ENSURE_TRUE(currRow, SQLITE_NOMEM);
int *prevRow = row1.AppendElements(sLen + 1);
int *currRow = row2.AppendElements(sLen + 1);
// Initialize the first row.
for (uint32_t i = 0; i <= sLen; i++)