Compiler not recognizing myArray[0];

[Mike B]

In the GNU g++ compiler, I can't get it to recognize the following as a
compiler error:

typedef bool integerSizeCheck [sizeof(int) == 0];

Shouldn't the compiler not allow me to do this? Is there some option I
can turn on to allow me to use this style of "compile-time assert"?

 

[Ivan Vecerina]

In the GNU g++ compiler, I can't get it to recognize the following as a
compiler error:

typedef bool integerSizeCheck [sizeof(int) == 0];

Shouldn't the compiler not allow me to do this? Is there some option I
can turn on to allow me to use this style of "compile-time assert"?

For the g++ option that will make a zero-size array, you should
ask on a g++ group/mailing list.

But the following might fail in a more portable/reliable way:
typedef bool integerSizeCheck[-1+2*( sizeof(int)==0 )];
If it still does not fail as expected, the following might do:
typedef struct { char compile_check[2*!!(expr)-1]; } integerSizeCheck;


hth -Ivan

 

[Rapscallion]

In the GNU g++ compiler, I can't get it to recognize the following as a
compiler error:

typedef bool integerSizeCheck [sizeof(int) == 0];

Shouldn't the compiler not allow me to do this? Is there some option I
can turn on to allow me to use this style of "compile-time assert"?

#define CT_ASSERT(expr) typedef char CT_Check [(expr)?1:-1];

CT_ASSERT(sizeof(int) == 0)