[Boost-users] A question on switch_statement. Can any one with kindness help me?

I am using Dev-C++ with boost lambda expression, and I wrote the following lines: ................ int result,switchvalue; .............. (switch_statement(_1, case_statement<1> (var(result)=0), case_statement<2> (var(result)=1), case_statement<3> (var(result)=constant(value)), default_statement (var(std::cout)<<"wrong") ))(switchvalue); but the complier told me that: instantiated from `Arg::sig