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15 lines
562 B
Go
15 lines
562 B
Go
package cutil
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import "unsafe"
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// VoidPtr casts a uintptr value to an unsafe.Pointer value in order to use it
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// directly as a void* argument in a C function call.
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// CAUTION: NEVER store the result in a variable, or the Go GC could panic.
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func VoidPtr(i uintptr) unsafe.Pointer {
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var nullPtr unsafe.Pointer
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// It's not possible to cast uintptr directly to unsafe.Pointer. Therefore we
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// cast a null pointer to uintptr and apply pointer arithmetic on it, which
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// allows us to cast it back to unsafe.Pointer.
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return unsafe.Pointer(uintptr(nullPtr) + i)
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}
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