add nrvo_by_default/

1 files changed, 73 insertions, 0 deletions

diff --git a/nrvo_by_default/rvo.cpp b/nrvo_by_default/rvo.cpp
new file mode 100644
index 0000000..f8c8f32
--- /dev/null
+++ b/nrvo_by_default/rvo.cpp
@@ -0,0 +1,73 @@
+#include <iostream>
+#include <utility>
+
+namespace
+{
+    class C
+    {
+    public:
+        explicit C()
+        {
+            std::cout << "\tC::C()\n";
+        }
+
+        C(C&&) noexcept
+        {
+            std::cout << "\tC::C(C&&)\n";
+        }
+
+        C(const C&)
+        {
+            std::cout << "\tC::C(const C&)\n";
+        }
+
+        C& operator=(C&&) noexcept
+        {
+            std::cout << "\tC::operator=(C&&)\n";
+            return *this;
+        }
+
+        C& operator=(const C&)
+        {
+            std::cout << "\tC::operator=(const C&)\n";
+            return *this;
+        }
+
+        ~C()
+        {
+            std::cout << "\tC::~C()\n";
+        }
+    };
+
+    C make_rvo()
+    {
+        return C{};
+    }
+
+    C make_nrvo()
+    {
+        C c;
+        return c;
+    }
+}
+
+int main()
+{
+    {
+        std::cout << "C c\n";
+        C c;
+    }
+    {
+        std::cout << "C c(make_rvo())\n";
+        C c(make_rvo());
+    }
+    {
+        std::cout << "C c{make_rvo()}\n";
+        C c{make_rvo()};
+    }
+    {
+        std::cout << "C c = make_rvo()\n";
+        C c = make_rvo();
+    }
+    return 0;
+}