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Summary
Macro
Decrements the reference count of a pointer by one. This macro also sets the pointer to NULL. NS_IF_RELEASE has no effect when the pointer is NULL. This macro should only be used when the pointer might be NULL; otherwise, use NS_RELEASE.
NS_IF_RELEASE is exactly equivalent to the following function:
inline void NS_IF_RELEASE(nsISupports* foo)
{
if (foo)
foo->Release();
foo = 0;
}
Syntax
NS_IF_RELEASE(foo);