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bbf9ef606d
* restrict casting for closure. This commit forbid casting a closure to anything other than another closure. use rawEnv/rawProc to access underlaying pointers. * better error message for closure cast * fixes #5742
24 lines
510 B
Nim
24 lines
510 B
Nim
discard """
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output: '''
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Hello World
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Hello World'''
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"""
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type MyProc = proc() {.cdecl.}
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type MyProc2 = proc() {.nimcall.}
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type MyProc3 = proc() #{.closure.} is implicit
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proc testProc() = echo "Hello World"
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proc callPointer(p: pointer) =
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# can cast to proc(){.cdecl.}
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let ffunc0 = cast[MyProc](p)
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# can cast to proc(){.nimcall.}
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let ffunc1 = cast[MyProc2](p)
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# cannot cast to proc(){.closure.}
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doAssert(not compiles(cast[MyProc3](p)))
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ffunc0()
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ffunc1()
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callPointer(cast[pointer](testProc))
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