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

11 Apr 2009


      AMDG

Suman Kar wrote:
...
I have just started with BLL. The following sample shows where I am stuck:
#include <string>
#include <cctype>
#include 
#include 
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