What is the cost of #define?

Question

To define constants, what is the more common and correct way? What is the cost, in terms of compilation, linking, etc., of C # define constants? Is this another way cheaper?

Answer 1

The best way to define any const is to write

const int m = 7;
const float pi = 3.1415926f;
const char x = 'F';

Usage #defineis bad C ++ style. Cannot be hidden #definein namespace scope.

Comparison

#define pi 3.1415926

from

namespace myscope {
const float pi = 3.1415926f;
}

The second way is obviously better.

Answer 2

#define. . , ... .

#define SOME_STRING "Just an example"

, . , , , , . const, .

Answer 3

, #defines ( , #defines , ).

Answer 4

#define , . , -, .

const .

const unsigned int ArraySize = 100;

static const unsigned int ArraySize = 100;

.

Answer 5

#define , ...

#define...

const

...

Answer 6

#define - . , , , . .

. , , const .

Answer 7

CPU - #define . "" :

• , , , , .
• .
• .

, .

const, .