Hi, I found a typo: Here: http://www.boost.org/doc/libs/1_36_0/libs/utility/in_place_factories.html Chapter: Framework In the First example: struct C { template<class InPlaceFactory> C ( InPlaceFactory const& aFactoty ) //<----------Here! should be "aFactory" : contained_ ( uninitialized_storage() ) { aFactory.template apply<X>(contained_); } ~C() { contained_ -> X::~X(); delete[] contained_ ; } char* uninitialized_storage() { return new char[sizeof(X)] ; } char* contained_ ; } ; void foo() { C c( in_place(123,"hello") ) ; } Greetings Manuel