[Boost-users] [lambda] Understanding placeholders

Why is this wrong? #include "boost/lambda/lambda.hpp" #include "boost/lambda/bind.hpp" #include <iostream> int main( ) { using namespace boost :: lambda; int i = 2, j = 3; bind( bind( protect( _1 = _2 ), _2, _1 ), _1, _2 )( i, j ); std :: cout << "i = " << i << ", j = " << j << "\n"; } Thanks, Rob.