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more than one line in macro else the other two statements will always execute
Note that in C, string literals next to each other are concatenated, so something like "token" " is " " this " will effectively become "token is this".
do
{ statement(s);
}while( condition );
if(boolean_expression)
{
/* statement(s) will execute if the boolean expression is true */
}
else
{
/* statement(s) will execute if the boolean expression is false */
}
Avoiding Macros in C++
In C++, you should generally avoid macros when possible. You won't be able to avoid them entirely if you need the ability to paste tokens together, but with templated classes and type inference for templated functions, you shouldn't need to use macros to create type-neutral code. Inline functions should also get rid of the need for macros for efficiency reasons. (Though you aren't guaranteed that the compiler will inline your code.)
Moreover, you should use const to declare typed constants rather than #define to create untyped (and therefore less safe) constants. Const should work in pretty much all contexts where you would want to use a #define, including declaring static sized arrays or as template parameters.
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