fix monolithic compilation and add usage comment

git-svn-id: svn://svn.lyx.org/lyx/lyx-devel/trunk@23690 a592a061-630c-0410-9148-cb99ea01b6c8
This commit is contained in:
André Pönitz 2008-03-12 19:39:14 +00:00
parent ad5ba124be
commit efe96e2ff9

View File

@ -8,10 +8,24 @@
*
* Full author contact details are available in file CREDITS.
*
* A collection of unicode conversion functions, using iconv.
*/
#ifndef FOREACH_H
#define FOREACH_H
// Code stolen from Q_FOREACH, augmented to use a reference to the
// original container instead of a copy. Copies are cheap (if not
// mutated) for Qt's containers due to copy-on-write. The are less
// cheap for Standard containers, that's why the modification.
// Drawback is that we can't use temporary containers as they
// will be destroyed before the loop is finished. So always write
//
// Container const & container = functionReturningTemporaryOrReference()
// foreach (ContainerItem const & item, container) {
// ...
// }
//
// to extend the lifetime of the reference.
#if defined(Q_CC_GNU) && !defined(Q_CC_INTEL)