NS_IF_RELEASE 编辑

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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);

See Also

NS_ADDREF, NS_RELEASE