Re: [Boost-users] BLL: ::toupper( _1) generates C2664

Subject: Re: [Boost-users] BLL: ::toupper( _1) generates C2664
From: Steven Watanabe (watanabesj_at_[hidden])
Date: 2009-04-11 12:09:35

AMDG

Suman Kar wrote:
> I have just started with BLL. The following sample shows where I am stuck:
>
> #include <string>
> #include <cctype>
> #include <boost/lambda/bind.hpp>
> #include <boost/lambda/lambda.hpp>
>
> int main() {
>     using namespace std;
>     using namespace boost::lambda;
>
>     string s("hello, world");
>     for_each(s.begin(), s.end(), _1 = ::toupper(_1));
>
>     return 0;
> }
>
> I hit a C2664: cannot convert parameter 1 from
> 'boost::lambda::placeholder1_type' to 'int'.
> I am using VS2005. Unfortunately, I do not have access to gcc at the
> moment to validate
> this (dig further).
>
> Of course, I can get the sample to work if I change the for_each
> invocation to use a bind:
>
>         for_each(s.begin(), s.end(), _1 = bind(::toupper, _1));
>   

Exactly.  The correct solution is bind.

In Christ,
Steven Watanabe