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Cgo: cannot access struct field called type #25458

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jech opened this issue May 18, 2018 · 4 comments
Closed

Cgo: cannot access struct field called type #25458

jech opened this issue May 18, 2018 · 4 comments
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@jech
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jech commented May 18, 2018

go version go1.10.1 linux/amd64

I'm using a C library that manipulates a struct that has a field called type. I see no way to access the field without going through a wrapper function written in C.

Here's a fairly minimal example that reproduces the problem:

/*
struct foo {
    int type;
};
*/
import "C"

func foo_type (x *C.struct_foo) int
    return int(x.type);
}
@AlexRouSg
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https://golang.org/cmd/cgo/

Within the Go file, C's struct field names that are keywords in Go can be accessed by prefixing them with an underscore: if x points at a C struct with a field named "type", x._type accesses the field. C struct fields that cannot be expressed in Go, such as bit fields or misaligned data, are omitted in the Go struct, replaced by appropriate padding to reach the next field or the end of the struct.

@agnivade
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Working as intended.

@jech
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jech commented May 18, 2018 via email

@jech
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jech commented May 18, 2018 via email

@golang golang locked and limited conversation to collaborators May 18, 2019
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@jech @agnivade @AlexRouSg @gopherbot