last changes from bloomberg.

cpp/cpp11/forwarding_reference.cpp

@@ -0,0 +1,102 @@
+/*
+VIM: let b:lcppflags="-std=c++14 -O2 -pthread -I."
+VIM: let b:wcppflags="/O2 /EHsc /DWIN32"
+VIM-: let b:cppflags=g:Iboost.g:Itbb
+VIM-: let b:ldflags=g:Lboost.g:Ltbb
+VIM-: let b:ldlibpath=g:Bboost.g:Btbb
+VIM-: let b:argv=""
+*/
+#include <iostream>
+#include <exception>
+
+class A
+{
+public:
+    int i;
+
+    A() {
+        std::cout << "default ctr" << std::endl;
+    }
+
+    A(const A&) {
+        std::cout << "copy ctr" << std::endl;
+    }
+
+    A(A&&) {
+        std::cout << "move ctr" << std::endl;
+    }
+
+    void operator = (const A&) {
+        std::cout << "copy" << std::endl;
+    }
+
+    void operator = (A&&) {
+        std::cout << "move" << std::endl;
+    }
+};
+
+void test3( A a ){
+    std::cout << "by value" << std::endl;
+}
+void test3( A&& a ){
+    std::cout << "rvalue" << std::endl;
+}
+void test3( const A& a ){
+    std::cout << "const lvalue&" << std::endl;
+}
+void test3( A& a ){
+    std::cout << "lvalue &" << std::endl;
+}
+
+
+template <typename T>
+void test2( T&& t ){
+    test3(std::forward<T>(t));
+}
+
+template <typename T>
+void test( T t ){
+    //test2(std::forward<T>(t));
+    test3(t);
+}
+
+A rvalue()
+{
+    return A();
+}
+
+A& lvalue()
+{
+    static A a;
+    return a;
+}
+
+const A& clvalue()
+{
+    static A a;
+    return a;
+}
+
+
+int main ( void )
+{try{
+
+    test(rvalue());
+    test(lvalue());
+    test(clvalue());
+
+    return 0;
+}
+catch ( const std::exception& e )
+{
+    std::cerr << std::endl
+            << "std::exception(\"" << e.what() << "\")." << std::endl;
+    return 2;
+}
+catch ( ... )
+{
+    std::cerr  << std::endl
+            << "unknown exception." << std::endl;
+    return 1;
+}}
+