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/********************* */
/*! \file utility.h
** \verbatim
** Original author: mdeters
** Major contributors: none
** Minor contributors (to current version): none
** This file is part of the CVC4 prototype.
** Copyright (c) 2009-2012 New York University and The University of Iowa
** See the file COPYING in the top-level source directory for licensing
** information.\endverbatim
**
** \brief Some standard STL-related utility functions for CVC4
**
** Some standard STL-related utility functions for CVC4.
**/
#include "cvc4_private.h"
#ifndef __CVC4__UTILITY_H
#define __CVC4__UTILITY_H
#include <utility>
#include <functional>
namespace CVC4 {
/**
* Like std::equal_to<>, but tests equality between the first element
* of a pair and an element.
*/
template <class T, class U>
struct first_equal_to : std::binary_function<std::pair<T, U>, T, bool> {
bool operator()(const std::pair<T, U>& pr, const T& x) const {
return pr.first == x;
}
};/* struct first_equal_to<T> */
/**
* Like std::equal_to<>, but tests equality between the second element
* of a pair and an element.
*/
template <class T, class U>
struct second_equal_to : std::binary_function<std::pair<T, U>, U, bool> {
bool operator()(const std::pair<T, U>& pr, const U& x) const {
return pr.second == x;
}
};/* struct first_equal_to<T> */
/**
* Using std::find_if(), finds the first iterator in [first,last)
* range that satisfies predicate. If none, return last; otherwise,
* search for a second one. If there IS a second one, return last,
* otherwise return the first (and unique) iterator satisfying pred().
*/
template <class InputIterator, class Predicate>
inline InputIterator find_if_unique(InputIterator first, InputIterator last, Predicate pred) {
InputIterator match = std::find_if(first, last, pred);
if(match == last) {
return last;
}
InputIterator match2 = match;
match2 = std::find_if(++match2, last, pred);
return (match2 == last) ? match : last;
}
template <class T>
inline T gcd(T a, T b) {
while (b != 0) {
a = b;
b = a % b;
}
return a;
}
}/* CVC4 namespace */
#endif /* __CVC4__UTILITY_H */
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