Re: [Boost-users] Using boost::lambda::bind with std::transform

Yes. I've tried the ptr to std::string::replace here what I get after bunch of template errors: /usr/include/boost/bind/mem_fn_template.hpp:339: error: invalid conversion from 'const std::basic_string*' to 'std::basic_string*' Kobi. On 4/27/06, Kobi Cohen-Arazi wrote:

Hi Sebastian,

You are 100% right. The return by reference is wrong. and the removeConst is absolutely not needed. It works just fine without. And I understand why adding & to the std::string is wrong.

So just a quick recap, to see if we have 100% of the solution: There is no way to use directly the std::string::replace since get() is const member function. We do need a replace wrapper, which unfortunately creating std::string instances.

Am I right here?

Thanks for your help! Kobi.

On 4/27/06, Sebastian Redl wrote:

...

Kobi Cohen-Arazi wrote:

...

Will not work ! Why adding the & hurts? Kobi.

Because you attempt to bind a non-const reference to a temporary object (the return value of get(). The compiler refuses to do that. The compiler doesn't catch another possibly problematic situation, though, and that's replace's return by reference. You're returning a reference to a function parameter, and that's generally not a good idea.

On the other hand, the removeConst function does absolutely nothing in your program except create yet another copy of the string. get() already returns a copy. The function is const, but its return value is not a const reference.

Sebastian Redl _______________________________________________ Boost-users mailing list Boost-users@lists.boost.org http://lists.boost.org/mailman/listinfo.cgi/boost-users