Hi Chih-Long, > blah z((blah())); // expecting calling blah::blah() and blah::blah(blah&&) but got only blah::blah() C++ allows this to be optimized, by eliding the copy constructor. This optimization is in the ISO 14882 specification. This C++ optimization will occur even if you¹ve disabled GCC¹s optimizations (-O0). Try this flag to disable the C++ optimization: -fno-elide-constructors HTH, <Eljay
