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I am trying to use std::shared_ptr in my code. I have seen there have been other questions on the subject, but I am still getting a compiler error. Have I got the right version of gcc and setup? What I have done: I have tried to compile my code with both headers separately — <memory> and <tr1/memory> but still get the errors below in both cases. The version of gcc I am using is gcc --version gcc (GCC) 4.3.2 When I include <memory> header I use std::shared_ptr and with the <tr1/memory> header I use std::tr1::shared_ptr ? Is this correct? I have set up the shared_ptr as follows: std::shared_ptr<A*> ptr_A = shared_ptr( new A() ); The error I get is as follows: src/WH.cxx:156: error: 'shared_ptr' is not a member of 'std' src/WH.cxx:162: error: 'shared_ptr' was not declared in this scope when I try the <tr1/memory> header src/WH.cxx:156: error: 'std::tr1' has not been declared src/WH.cxx:162: error: 'shared_ptr' was not declared in this scope Looks like I am not including something correctly. Any ideas? I know the boost library has shared_ptr but these libraries are not an option for me at the moment. EDIT: Just to add, my compiler options are as follows: g++ -O3 -g3 -m32 -fPIC -Wno-deprecated -pthread -m32 Am I missing anything? P.S. Is there any useful literature on the std smart pointers?

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