Ichthyostega
2b46574da3
(because util.hpp is used pervasively, and I don't want <tr1/functional> in such a widely used header...
87 lines
2.2 KiB
C++
87 lines
2.2 KiB
C++
/*
|
|
UTIL-FOREACH.hpp - helpers for doing something for each element
|
|
|
|
Copyright (C) Lumiera.org
|
|
2009, Hermann Vosseler <Ichthyostega@web.de>
|
|
|
|
This program is free software; you can redistribute it and/or
|
|
modify it under the terms of the GNU General Public License as
|
|
published by the Free Software Foundation; either version 2 of the
|
|
License, or (at your option) any later version.
|
|
|
|
This program is distributed in the hope that it will be useful,
|
|
but WITHOUT ANY WARRANTY; without even the implied warranty of
|
|
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
|
|
GNU General Public License for more details.
|
|
|
|
You should have received a copy of the GNU General Public License
|
|
along with this program; if not, write to the Free Software
|
|
Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
|
|
|
|
*/
|
|
|
|
|
|
#ifndef UTIL_FOREACH_H
|
|
#define UTIL_FOREACH_H
|
|
|
|
#include "lib/util.hpp"
|
|
|
|
#include <algorithm>
|
|
|
|
|
|
|
|
namespace util {
|
|
|
|
|
|
|
|
/** shortcut for operating on all elements of a container.
|
|
* Isn't this already defined somewhere? It's so obvious..
|
|
*/
|
|
template <typename Container, typename Oper>
|
|
inline Oper
|
|
for_each (Container& c, Oper doIt)
|
|
{
|
|
return std::for_each (c.begin(),c.end(), doIt);
|
|
}
|
|
|
|
|
|
/** All quantification: check if all elements of a collection
|
|
* satisfy the given predicate. Actually a short-circuit
|
|
* evaluation is performed.
|
|
*/
|
|
template <typename SEQ, typename Oper>
|
|
inline bool
|
|
and_all (SEQ& coll, Oper predicate)
|
|
{
|
|
typename SEQ::const_iterator e = coll.end();
|
|
typename SEQ::const_iterator i = coll.begin();
|
|
|
|
for ( ; i!=e; ++i )
|
|
if (!predicate(*i))
|
|
return false;
|
|
|
|
return true;
|
|
}
|
|
|
|
|
|
/** Existential quantification: check if any element
|
|
* of a collection satisfies the given predicate.
|
|
* Actually, a short-circuit evaluation is performed.
|
|
*/
|
|
template <typename SEQ, typename Oper>
|
|
inline bool
|
|
has_any (SEQ& coll, Oper predicate)
|
|
{
|
|
typename SEQ::const_iterator e = coll.end();
|
|
typename SEQ::const_iterator i = coll.begin();
|
|
|
|
for ( ; i!=e; ++i )
|
|
if (predicate(*i))
|
|
return true;
|
|
|
|
return false;
|
|
}
|
|
|
|
|
|
} // namespace util
|
|
#endif /*UTIL_FOREACH_H*/
|