new functions min and max for 2 - 2+n parameters - now in C++11 vith variadics

src/mrw/stdext.hxx

@@ -16,6 +16,7 @@
 #include <string>
 #include <iostream>
 #include <algorithm>
+#include <mrw/checkcxx11.hxx>
 
 namespace mrw {
 
@@ -52,6 +53,11 @@ namespace mrw {
   template<typename T> T& max(T& t1, T& t2) {
     return t2<t1?t1:t2;
   }
+  //! Get the maximum out of two values
+  template<typename T> const T& max(const T& t1, const T& t2) {
+    return t2<t1?t1:t2;
+  }
+#ifdef MRW__OLD_PRE11_COMPILER
   //! Get the maximum out of three values
   template<typename T> T& max(T& t1, T& t2, T& t3) {
     return max(t1, max(t2, t3));
@@ -68,10 +74,6 @@ namespace mrw {
   template<typename T> T& max(T& t1, T& t2, T& t3, T& t4, T& t5, T& t6) {
     return max(max(t1, t2, t3), max(t4, t5, t6));
   }
-  //! Get the maximum out of two values
-  template<typename T> const T& max(const T& t1, const T& t2) {
-    return t2<t1?t1:t2;
-  }
   //! Get the maximum out of three values
   template<typename T> const T& max(const T& t1, const T& t2, const T& t3) {
     return max(t1, max(t2, t3));
@@ -91,6 +93,17 @@ namespace mrw {
                                     const T& t4, const T& t5, const T& t6) {
     return max(max(t1, t2, t3), max(t4, t5, t6));
   }
+#else
+  //! Get the maximum out of any number of arguments
+  template<typename T, typename... T2> T& max(T& t1, T& t2, T2&... args) {
+    return max(t1, max(t2, args...));
+  }
+  //! Get the maximum out of any number of arguments
+  template<typename T, typename... T2> const T& max(const T& t1, const T& t2,
+                                                    const T2&... args) {
+    return max(t1, max(t2, args...));
+  }
+#endif
   //@}
 
   /** @defgroup getmin Get the Minimum of Values */
@@ -99,6 +112,11 @@ namespace mrw {
   template<typename T> T& min(T& t1, T& t2) {
     return t1<t2?t1:t2;
   }
+  //! Get the minimum out of two values
+  template<typename T> const T& min(const T& t1, const T& t2) {
+    return t1<t2?t1:t2;
+  }
+#ifdef MRW__OLD_PRE11_COMPILER
   //! Get the minimum out of three values
   template<typename T> T& min(T& t1, T& t2, T& t3) {
     return min(t1, min(t2, t3));
@@ -115,10 +133,6 @@ namespace mrw {
   template<typename T> T& min(T& t1, T& t2, T& t3, T& t4, T& t5, T& t6) {
     return min(min(t1, t2, t3), min(t4, t5, t6));
   }
-  //! Get the minimum out of two values
-  template<typename T> const T& min(const T& t1, const T& t2) {
-    return t2<t1?t1:t2;
-  }
   //! Get the minimum out of three values
   template<typename T> const T& min(const T& t1, const T& t2, const T& t3) {
     return min(t1, min(t2, t3));
@@ -138,6 +152,17 @@ namespace mrw {
                                     const T& t4, const T& t5, const T& t6) {
     return min(min(t1, t2, t3), min(t4, t5, t6));
   }
+#else
+  //! Get the minimum out of any number of arguments
+  template<typename T, typename... T2> T& min(T& t1, T& t2, T2&... args) {
+    return min(t1, min(t2, args...));
+  }
+  //! Get the minimum out of any number of arguments
+  template<typename T, typename... T2> const T& min(const T& t1, const T& t2,
+                                                    const T2&... args) {
+    return min(t1, min(t2, args...));
+  }
+#endif
   //@}
 
   /** @brief Dual <code>?:</code> operation:

test/stdext_test.cxx

@@ -29,6 +29,7 @@
 #include <mrw/multiset.hxx>
 #include <mrw/multimap.hxx>
 #include <mrw/stacktrace.hxx>
+#include <mrw/stdext.hxx>
 #include <cppunit/TestFixture.h>
 #include <cppunit/ui/text/TestRunner.h>
 #include <cppunit/extensions/HelperMacros.h>
@@ -64,7 +65,8 @@ public:
     void StringAdd() {
       std::string s;
       s=s+(signed short)1+(signed int)2+(signed long)3+(signed char)'A'+
-      (unsigned short)1+(unsigned int)2+(unsigned long)3+(unsigned char)'A'+'c';
+        (unsigned short)1+(unsigned int)2+(unsigned long)3+(unsigned char)'A'
+        +'c';
       CPPUNIT_ASSERT_EQUAL(std::string("1236512365c"), s);
       s=(signed short)-4+s;
       s=(signed int)5+s;
@@ -250,6 +252,25 @@ public:
       std::string s("Hello World");
       mrw::to<int>(s); // not an int, exception expected
     }
+    void Max() {
+      int a1(3), a2(23), a3(2), a4(432), a5(73), a6(32);
+      CPPUNIT_ASSERT_EQUAL(432, mrw::max(a1, a2, a3, a4, a5, a6));
+      CPPUNIT_ASSERT_EQUAL(432, mrw::max(a1, a2, a3, a4, a5, a6));
+      CPPUNIT_ASSERT_EQUAL(73, mrw::max(a1, a2, a3, a5, a6));
+      CPPUNIT_ASSERT_EQUAL(32, mrw::max(a1, a2, a3, a6));
+      CPPUNIT_ASSERT_EQUAL(23, mrw::max(a1, a2, a3));
+      CPPUNIT_ASSERT_EQUAL(3, mrw::max(a1, a3));
+      CPPUNIT_ASSERT_EQUAL(42, mrw::max(3, 42, 6, 1));
+    }
+    void Min() {
+      int a1(3), a2(23), a3(2), a4(432), a5(73), a6(32);
+      CPPUNIT_ASSERT_EQUAL(2, mrw::min(a1, a2, a3, a4, a5, a6));
+      CPPUNIT_ASSERT_EQUAL(3, mrw::min(a1, a2, a4, a5, a6));
+      CPPUNIT_ASSERT_EQUAL(23, mrw::min(a2, a4, a5, a6));
+      CPPUNIT_ASSERT_EQUAL(32, mrw::min(a4, a5, a6));
+      CPPUNIT_ASSERT_EQUAL(73, mrw::min(a4, a5));
+      CPPUNIT_ASSERT_EQUAL(42, mrw::min(323, 42, 126, 91));
+    }
     CPPUNIT_TEST_SUITE(StdExtTest);
     CPPUNIT_TEST(StringConv);
     CPPUNIT_TEST(StringShift);
@@ -261,6 +282,8 @@ public:
     CPPUNIT_TEST(MapShift);
     CPPUNIT_TEST(MultisetShift);
     CPPUNIT_TEST(MultimapShift);
+    CPPUNIT_TEST(Max);
+    CPPUNIT_TEST(Min);
     CPPUNIT_TEST_EXCEPTION(StringException1, mrw::invalid_argument);
     CPPUNIT_TEST_EXCEPTION(StringException2, mrw::invalid_argument);
     CPPUNIT_TEST_SUITE_END();