Testing infastructure: A template for char_traits where all the functions are constexpr, and a comparison predicate which counts how many times it's been called.
llvm-svn: 210381
diff --git a/libcxx/test/support/counting_predicates.hpp b/libcxx/test/support/counting_predicates.hpp
new file mode 100644
index 0000000..eef7daf
--- /dev/null
+++ b/libcxx/test/support/counting_predicates.hpp
@@ -0,0 +1,47 @@
+//===----------------------------------------------------------------------===//
+//
+// 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