Move all C++ tests to cpp.

cpp/test_copy_elision.cpp

@@ -0,0 +1,169 @@
+#include <iostream>
+#include <exception>
+#include <string>
+#include <algorithm>
+
+struct copy_tracker
+{
+	int v;
+
+	copy_tracker()
+		: v(0)
+	{
+		std::cout << "copy_tracker::copy_tracker()" << std::endl;
+	}
+
+	copy_tracker( const copy_tracker& c )
+		: v( c.v )
+	{
+		std::cout << "copy_tracker::copy_tracker( const copy_tracker& c )" << std::endl;
+	}
+
+	copy_tracker( copy_tracker&& c )
+		: v( c.v )
+	{
+		std::cout << "copy_tracker::copy_tracker( copy_tracker&& c )  MOVE " << std::endl;
+	}
+
+	void use_object()
+	{
+		std::cout << v << std::endl;
+	}
+};
+
+template <int n>
+copy_tracker return_by_value()
+{
+	return return_by_value<n-1>();
+}
+template <>
+copy_tracker return_by_value<1>()
+{
+	return copy_tracker();
+}
+
+template <int n>
+copy_tracker return_by_value2()
+{
+	copy_tracker o = return_by_value2<n-1>();
+	o.v = n;
+	return o;
+}
+template <>
+copy_tracker return_by_value2<1>()
+{
+	copy_tracker o; //return value optimization still applies.
+	o.v = 1;
+	return o;
+}
+
+template <int n>
+copy_tracker static_by_value()
+{
+	return static_by_value<n-1>();
+}
+template <>
+copy_tracker static_by_value<1>()
+{
+	static copy_tracker o; //return value optimization still applies.
+	return o;
+}
+
+
+template <int n>
+copy_tracker move_by_value()
+{
+	return std::move(move_by_value<n-1>());
+}
+template <>
+copy_tracker move_by_value<1>()
+{
+	return copy_tracker(); //return value optimization still applies.
+}
+
+
+template <int n>
+void pass_by_value(copy_tracker o)
+{
+	pass_by_value<n-1>(std::move(o));
+//	o.v = n;
+//	o.use_object();
+}
+template <>
+void pass_by_value<1>(copy_tracker o)
+{
+	o.use_object();
+}
+
+
+void test_copy_tracker()
+{
+	std::cout << "---------------------------------------------------------" 
+				<< std::endl << std::endl;
+	
+	std::cout << "Return by value and assign." << std::endl;
+	{ copy_tracker o = return_by_value<10>(); }
+	std::cout << "---------------------------------------------------------" 
+				<< std::endl << std::endl;
+
+	std::cout << "Return by named value and assign." << std::endl;
+	{ copy_tracker o = return_by_value2<10>(); }
+	std::cout << "---------------------------------------------------------" 
+				<< std::endl << std::endl;
+
+	std::cout << "Return static and assign." << std::endl;
+	{ copy_tracker o = static_by_value<10>(); }
+	std::cout << "---------------------------------------------------------" 
+				<< std::endl << std::endl;
+	
+	std::cout << "Move value and assign." << std::endl;
+	{ copy_tracker o = move_by_value<10>(); }
+	std::cout << "---------------------------------------------------------" 
+				<< std::endl << std::endl;
+
+	std::cout << "Pass lvalue." << std::endl;
+	{ copy_tracker o = return_by_value<10>();
+	  pass_by_value<1>( o ); }
+	std::cout << "---------------------------------------------------------" 
+				<< std::endl << std::endl;
+
+	std::cout << "Pass by intermediately captured rvalue." << std::endl;
+	{ const copy_tracker& o = return_by_value<10>();
+	  pass_by_value<1>( o ); }
+	std::cout << "---------------------------------------------------------" 
+				<< std::endl << std::endl;
+	
+	std::cout << "Pass by intermediately captured rvalue." << std::endl;
+	{ const copy_tracker& o = return_by_value<10>();
+	  pass_by_value<1>( static_cast<copy_tracker&&>(const_cast<copy_tracker&>(o)) ); }
+	std::cout << "---------------------------------------------------------" 
+				<< std::endl << std::endl;
+
+	std::cout << "Pass rvalue directly." << std::endl;
+	{ pass_by_value<1>( return_by_value<10>() ); }
+	std::cout << "---------------------------------------------------------" 
+				<< std::endl << std::endl;
+	
+	std::cout << "Pass rvalue directly." << std::endl;
+	{ pass_by_value<2>( return_by_value<10>() ); }
+	std::cout << "---------------------------------------------------------" 
+				<< std::endl << std::endl;
+}
+
+int main ( void )
+{try{
+
+	test_copy_tracker();
+	return 0;
+}
+catch ( const std::exception& e )
+{
+	std::cerr << std::endl
+			<< "std::exception(\"" << e.what() << "\")." << std::endl;
+}
+catch ( ... )
+{
+	std::cerr  << std::endl
+			<< "unknown exception." << std::endl;
+}}
+