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Prefer const and inline to #define macros in C/C++

Posted Date: 19 Jun 2008	Resource Type: Errors and Solutions	Category: General
Author: Lekshmi m nair	Member Level: Silver
Rating:	Points: 3

When you do something like this,


#define ASPECT_RATIO 1.653

the symbolic name ASPECT_RATIO may never be seen by compilers; it may be removed by the preprocessor before the source code ever gets to a compiler. So if you get an error during compilation involving the use of this constant, the error decription may not contain the symbolic name ASPECT_RATIO.

Instead of using a preprocessor macro, define a constant like


const double ASPECT_RATIO = 1.653;

to solve the issue. Instead of using #define directive to implement macros that look like functions, use inline functions.You can get all the efficiency of a macro plus all the predictable behavior and type-safety of a regular function.

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