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cmd/cgo: clarify the underscore prefix rule and C union representation in Go.

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R=golang-dev, rsc
CC=golang-dev
https://golang.org/cl/10981043
This commit is contained in:
Shenghou Ma 2013-07-12 04:34:04 +08:00
parent 32fef9908a
commit 555e51f27b
1 changed files with 4 additions and 1 deletions
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src/cmd/cgo/doc.go
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@ -49,7 +49,7 @@ to the flags derived from these directives. Package-specific flags should
be set using the directives, not the environment variables, so that builds be set using the directives, not the environment variables, so that builds
work in unmodified environments. work in unmodified environments.
Within the Go file, C identifiers or field names that are keywords in Go 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 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. struct with a field named "type", x._type accesses the field.
@ -63,6 +63,9 @@ The C type void* is represented by Go's unsafe.Pointer.
To access a struct, union, or enum type directly, prefix it with To access a struct, union, or enum type directly, prefix it with
struct_, union_, or enum_, as in C.struct_stat. struct_, union_, or enum_, as in C.struct_stat.
As Go doesn't have support for C's union type in the general case,
C's union types are represented as a Go byte array with the same length.
Go structs cannot embed fields with C types. Go structs cannot embed fields with C types.
Any C function (even void functions) may be called in a multiple Any C function (even void functions) may be called in a multiple