is_sorted() concept check fails in eval_if<>

[JonT]

The following worked in 1.38, but fails to compile in 1.45, 1.47 and head.

#include <vector>
#include <algorithm>
#include <boost/detail/algorithm.hpp>


void testfunc()
{
        std::vector<double> myVec(100);
                        
        if (!boost::is_sorted(myVec.begin(),myVec.end()) )
        {
                /* empty */
        }
}

The error log is attached.

[JonT <jon@…>]

build log of compile errors

[JonT <jon@…>]

Test case compiles in 1.42 but not 1.43

[Neil Groves]

This isn't a defect. The compile-log shows a reasonably clear indication that iterators are being based in to an algorithm that requires a model of the SinglePassRange concept.

Your code should read:

if (!boost::is_sorted(myVec)) { }