How do I create a const boost::iterator_range

Question

The comment at Why does boost::find_first take a non-const reference to its input? suggests \"the caller to create a non-const iterator_range with const_iterator template pa

Answer 1

Having non-const references to the range avoids binding to temporaries ¹

I'd avoid your conundrum² by letting the compiler do your work:

tMyMap const& my_map; // NOTE const
// ...

return boost::make_iterator_range(my_map.lower_bound(123), mymap.upper_bound(456));

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¹ Standard C++ extends lifetimes of temporaries bound to const-reference variables, but this doesn't apply to references bound to object members. Therefore, aggregating ranges by reference is very prone to this mistake.

/OT: IMO even with the precautions/checks some Boost Range features (like adaptors) are frequently too unsafe to use; I've fallen into those traps more often than I care to admit.

² apart from the fact that we cannot reproduce it from the sample you gave