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.

git-svn-id: https://llvm.org/svn/llvm-project/libcxx/trunk@210381 91177308-0d34-0410-b5e6-96231b3b80d8

test/support/constexpr_char_traits.hpp

@@ -0,0 +1,138 @@
+// -*- C++ -*-
+//===-------_------------ constexpr_char_traits ---------------------------===//
+//
+//                     The LLVM Compiler Infrastructure
+//
+// This file is distributed under the University of Illinois Open Source
+// License. See LICENSE.TXT for details.
+//
+//===----------------------------------------------------------------------===//
+
+#ifndef _CONSTEXPR_CHAR_TRAITS
+#define _CONSTEXPR_CHAR_TRAITS
+
+#include <__config>
+#include <string>
+
+
+template <class _CharT>
+struct constexpr_char_traits
+{
+    typedef _CharT    char_type;
+    typedef int       int_type;
+    typedef std::streamoff off_type;
+    typedef std::streampos pos_type;
+    typedef std::mbstate_t state_type;
+
+    static _LIBCPP_CONSTEXPR void assign(char_type& __c1, const char_type& __c2) _NOEXCEPT
+        {__c1 = __c2;}
+
+    static _LIBCPP_CONSTEXPR bool eq(char_type __c1, char_type __c2) _NOEXCEPT
+        {return __c1 == __c2;}
+
+    static _LIBCPP_CONSTEXPR  bool lt(char_type __c1, char_type __c2) _NOEXCEPT
+        {return __c1 < __c2;}
+
+    static _LIBCPP_CONSTEXPR_AFTER_CXX11 int              compare(const char_type* __s1, const char_type* __s2, size_t __n);
+    static _LIBCPP_CONSTEXPR_AFTER_CXX11 size_t           length(const char_type* __s);
+    static _LIBCPP_CONSTEXPR_AFTER_CXX11 const char_type* find(const char_type* __s, size_t __n, const char_type& __a);
+    static _LIBCPP_CONSTEXPR_AFTER_CXX11 char_type*       move(char_type* __s1, const char_type* __s2, size_t __n);
+    static _LIBCPP_CONSTEXPR_AFTER_CXX11 char_type*       copy(char_type* __s1, const char_type* __s2, size_t __n);
+    static _LIBCPP_CONSTEXPR_AFTER_CXX11 char_type*       assign(char_type* __s, size_t __n, char_type __a);
+
+    static _LIBCPP_CONSTEXPR int_type  not_eof(int_type __c) _NOEXCEPT
+        {return eq_int_type(__c, eof()) ? ~eof() : __c;}
+
+    static _LIBCPP_CONSTEXPR char_type to_char_type(int_type __c) _NOEXCEPT
+        {return char_type(__c);}
+
+    static _LIBCPP_CONSTEXPR int_type  to_int_type(char_type __c) _NOEXCEPT
+        {return int_type(__c);}
+
+    static _LIBCPP_CONSTEXPR bool      eq_int_type(int_type __c1, int_type __c2) _NOEXCEPT
+        {return __c1 == __c2;}
+
+    static _LIBCPP_CONSTEXPR int_type  eof() _NOEXCEPT
+        {return int_type(EOF);}
+};
+
+
+template <class _CharT>
+_LIBCPP_CONSTEXPR_AFTER_CXX11 int
+constexpr_char_traits<_CharT>::compare(const char_type* __s1, const char_type* __s2, size_t __n)
+{
+    for (; __n; --__n, ++__s1, ++__s2)
+    {
+        if (lt(*__s1, *__s2))
+            return -1;
+        if (lt(*__s2, *__s1))
+            return 1;
+    }
+    return 0;
+}
+
+template <class _CharT>
+_LIBCPP_CONSTEXPR_AFTER_CXX11 size_t
+constexpr_char_traits<_CharT>::length(const char_type* __s)
+{
+    size_t __len = 0;
+    for (; !eq(*__s, char_type(0)); ++__s)
+        ++__len;
+    return __len;
+}
+
+template <class _CharT>
+_LIBCPP_CONSTEXPR_AFTER_CXX11 const _CharT*
+constexpr_char_traits<_CharT>::find(const char_type* __s, size_t __n, const char_type& __a)
+{
+    for (; __n; --__n)
+    {
+        if (eq(*__s, __a))
+            return __s;
+        ++__s;
+    }
+    return 0;
+}
+
+template <class _CharT>
+_LIBCPP_CONSTEXPR_AFTER_CXX11 _CharT*
+constexpr_char_traits<_CharT>::move(char_type* __s1, const char_type* __s2, size_t __n)
+{
+    char_type* __r = __s1;
+    if (__s1 < __s2)
+    {
+        for (; __n; --__n, ++__s1, ++__s2)
+            assign(*__s1, *__s2);
+    }
+    else if (__s2 < __s1)
+    {
+        __s1 += __n;
+        __s2 += __n;
+        for (; __n; --__n)
+            assign(*--__s1, *--__s2);
+    }
+    return __r;
+}
+
+template <class _CharT>
+_LIBCPP_CONSTEXPR_AFTER_CXX11 _CharT*
+constexpr_char_traits<_CharT>::copy(char_type* __s1, const char_type* __s2, size_t __n)
+{
+    _LIBCPP_ASSERT(__s2 < __s1 || __s2 >= __s1+__n, "char_traits::copy overlapped range");
+    char_type* __r = __s1;
+    for (; __n; --__n, ++__s1, ++__s2)
+        assign(*__s1, *__s2);
+    return __r;
+}
+
+template <class _CharT>
+_LIBCPP_CONSTEXPR_AFTER_CXX11 _CharT*
+constexpr_char_traits<_CharT>::assign(char_type* __s, size_t __n, char_type __a)
+{
+    char_type* __r = __s;
+    for (; __n; --__n, ++__s)
+        assign(*__s, __a);
+    return __r;
+}
+
+#endif // _CONSTEXPR_CHAR_TRAITS

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