impl/foreach.hpp File Reference

Macros
#define	CXXO_FOREACH(itemdecl, collection)   for (implementation_specific_arguments;;)
	Foreach loop construct that iterates over collection . More...

Macro Definition Documentation

CXXO_FOREACH

#define CXXO_FOREACH	(		itemdecl,
			collection
	)		for (implementation_specific_arguments;;)

Foreach loop construct that iterates over collection .

See also

http://www.artima.com/cppsource/foreach.html

See also "<iterator> support" .

A foreach macro declares iteration over collection , which can be any STL-compatible sequence, using itemdecl as the iterating item.

Usage is as follows:

list<int> L = {2, 3, 5, 7, 11};
CXXO_FOREACH (int x, L) {
  cout<< x<< ' ';
}

When using C++11 onwards, this evaluates to the native range-for syntax, for zero overhead.

Note

FOREACH support varies according to compiler capabilities. In particular, for compilers that do not fully support at least C++98/C++03, the macro works only with lvalues.