John Love-Jensen wrote:
That, obviously, is NOT what you desire. You want some insurance that the
right hand value is checked and verified to be cast to the left hand BODY
value.
It is, perhaps, unfortunate that the compiler does not synthesize this for
you. But that's just not C++.
See the following code:
struct Struct1
{
int a, b ;
} ;
struct Struct2
{
int a, b ;
} ;
int main ( void )
{
Struct1 s1 ; Struct2 s2 ;
s1 . a = 2 ; s1 . b = 3 ;
// s2 = static_cast < Struct2 > ( s1 ) ; // gives error: no
matching function for call to ‘Struct2::Struct2(Struct1&)’
}
So the compiler itself checks whether it is possible to convert one
struct value to another when a static cast is requested. Similarly for
classes. I feel GCC can implement the same for enum-s too.
If it is not part of the C++ definition, then please tell me where I can
include a request for such a provision in the next C++ standard.
Shriramana Sharma.
