On Thu, Apr 8, 2010 at 2:47 PM, Conoscenza Silente <abruzzoforteegentile@gmail.com> wrote:

Hi Steven
sorry to bother you again..but the code doesn't work...I didn't try it yesterday when you replied..sorrry for this!
I read in the documentation that we need some short-circuiting for logical operators..

On Wed, Apr 7, 2010 at 5:22 PM, Steven Watanabe <watanabesj@gmail.com> wrote:

AMDG

Conoscenza Silente wrote:

I am trying to use boost::lambda using logicat operator.
I would like to use it in a STL std::find_if call.

What I receive is always the same error
error: no match for ‘operator==’ in ‘boost::lambda::<unnamed>::_1 == 13’

Do you know what I am doing wrong?
Thanks
AFG

using namespace boost::assign;

int main( int argc, char** argv ){

std::vector< int > v;
v += 12,13,14,15;

bool found_tmp = false;
boost::lambda::var_type< bool >::type found(
boost::lambda::var(found_tmp) );

std::find_if(
v.begin(),
v.end(),
(
found = ( boost::lambda::_1 == 13 ),
return found
) );
}

Don't try to return found inside the lambda expression.

Try

bool found = std::find_if(v.begin(), v.end(), boost::lambda::_1 == 13) != v.end();

In Christ,
Steven Watanabe

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