libcxx/test/support/counting_predicates.hpp

//===----------------------------------------------------------------------===//
//
//                     The LLVM Compiler Infrastructure
//
// This file is dual licensed under the MIT and the University of Illinois Open
// Source Licenses. See LICENSE.TXT for details.
//
//===----------------------------------------------------------------------===//

#ifndef __COUNTING_PREDICATES_H
#define __COUNTING_PREDICATES_H


template <typename Predicate>
struct unary_counting_predicate {
public:
	unary_counting_predicate(Predicate p) : p_(p), count_(0) {}
	~unary_counting_predicate() {}
	
	typedef typename Predicate::argument_type argument_type;
	typedef bool result_type;
	
	bool operator () (const argument_type &a) const { ++count_; return p_(a); }
	size_t count() const { return count_; }
	
private:
	Predicate p_;
	mutable size_t count_;
	};


template <typename Predicate, typename Arg1, typename Arg2=Arg1>
struct binary_counting_predicate : public std::binary_function<Arg1, Arg2, bool> {
public:

	binary_counting_predicate ( Predicate p ) : p_(p), count_(0) {}
	~binary_counting_predicate() {}
	
	bool operator () (const Arg1 &a1, const Arg2 &a2) const { ++count_; return p_(a1, a2); }
	size_t count() const { return count_; }
	
private:
	Predicate p_;
	mutable size_t count_;
	};

#endif // __COUNTING_PREDICATES_H