Is this code well-defined/legal?

[mclark]

Can someone tell me if function argument evaulation rules make this exaple code illegal...

class foo { public: int x; };

void bar(foo & c, int y = c.x) {}

note that the question is about referencing of foo's member data within an argument list via a reference argument within the same list.

[nsh123]

can we have variables as default values ?

[Paul McKenzie]

Originally posted by mclark
Can someone tell me if function argument evaulation rules make this exaple code illegal...

class foo { public: int x; };

void bar(foo & c, int y = c.x) {}

note that the question is about referencing of foo's member data within an argument list via a reference argument within the same list.

This is illegal. Non-static members cannot be used as default arguments. If x were declared as static, then the following will compile.

class foo { public: static int x; };

void bar(foo & c, int y = foo::x) {}

Regards,

Paul McKenzie