我可以在 c++/g++ 中做到这一点:
I can do this in c++/g++:
struct vec3 {
union {
struct {
float x, y, z;
};
float xyz[3];
};
};
那么,
vec3 v;
assert(&v.xyz[0] == &v.x);
assert(&v.xyz[1] == &v.y);
assert(&v.xyz[2] == &v.z);
会起作用.
如何用 gcc 在 c 中做到这一点?我有
How does one do this in c with gcc? I have
typedef struct {
union {
struct {
float x, y, z;
};
float xyz[3];
};
} Vector3;
但是我到处都有错误,特别是
But I get errors all around, specifically
line 5: warning: declaration does not declare anything
line 7: warning: declaration does not declare anything
根据 http://gcc.gnu.org/onlinedocs/gcc/Unnamed-Fields.html#Unnamed-Fields
-fms-extensions
将启用您(和我)想要的功能.
-fms-extensions
will enable the feature you (and I) want.
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