countof operator

In C++ the sizeof operator is pretty handy. It is also useful to know the size of an array. The countof operator is useful for that, here’s how you define it:

#define countof(a) (sizeof(array) / sizeof(0[(array)]))

And an example of how it could be used:

SomeStruct myStruct[] = { {value1,value2} , {value1_1,value2_1} };

for( int i=0; i<countof(myStruct); i++ )
myStruct[i].TheValueA = SomeNewValue;