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cgo: explain how to free something
R=golang-dev, n13m3y3r, r CC=golang-dev https://golang.org/cl/4958053
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@ -72,7 +72,10 @@ the pointer to the first element explicitly: C.f(&x[0]).
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A few special functions convert between Go and C types
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by making copies of the data. In pseudo-Go definitions:
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// Go string to C string - result is not garbage collected
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// Go string to C string
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// The C string is allocated in the C heap using malloc.
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// It is the caller's responsibility to arrange for it to be
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// freed, such as by calling C.free.
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func C.CString(string) *C.char
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// C string to Go string
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