281918b6aa
git-svn-id: https://llvm.org/svn/llvm-project/libcxx/trunk@210381 91177308-0d34-0410-b5e6-96231b3b80d8
48 lines
1.3 KiB
C++
48 lines
1.3 KiB
C++
//===----------------------------------------------------------------------===//
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//
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// The LLVM Compiler Infrastructure
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//
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// This file is dual licensed under the MIT and the University of Illinois Open
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// Source Licenses. See LICENSE.TXT for details.
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//
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//===----------------------------------------------------------------------===//
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#ifndef __COUNTING_PREDICATES_H
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#define __COUNTING_PREDICATES_H
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template <typename Predicate>
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struct unary_counting_predicate {
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public:
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unary_counting_predicate(Predicate p) : p_(p), count_(0) {}
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~unary_counting_predicate() {}
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typedef typename Predicate::argument_type argument_type;
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typedef bool result_type;
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bool operator () (const argument_type &a) const { ++count_; return p_(a); }
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size_t count() const { return count_; }
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private:
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Predicate p_;
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mutable size_t count_;
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};
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template <typename Predicate, typename Arg1, typename Arg2=Arg1>
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struct binary_counting_predicate : public std::binary_function<Arg1, Arg2, bool> {
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public:
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binary_counting_predicate ( Predicate p ) : p_(p), count_(0) {}
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~binary_counting_predicate() {}
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bool operator () (const Arg1 &a1, const Arg2 &a2) const { ++count_; return p_(a1, a2); }
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size_t count() const { return count_; }
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private:
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Predicate p_;
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mutable size_t count_;
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};
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#endif // __COUNTING_PREDICATES_H
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