C++.Coding.Standards.1918.Rules.Guidelines [Electronic resources] نسخه متنی

Examples

Example: Avoid

const

pass-by-value function parameters in function declarations.
The following two declarations are exactly equivalent:

void Fun( int x );
void Fun(

const int x );

// redeclares the same function: top-level const is ignored

In the second declaration, the

const is redundant. We recommend declaring functions without such top-level

const s, so that readers of your header files won't get confused. However, the top-level

const does make a difference in a function's

definition and can be sensible there to catch unintended changes to the parameter:

void Fun( const int x ) {

// Fun's actual definition

// …
++x;

// error: cannot modify a const value

// …
}