Required prerequisites
Problem description
I was a bit too clever (or not clever enough) when I refactored make_key_iterator and added make_value_iterator. For a normal, STL iterator everything is fine, but an iterator where dereferencing synthesizes a value on the fly (such as an input iterator) doesn't work correctly (unless it returns a pair of references). Due to some subtleties of decltype, the accessor functors end up returning a reference to a temporary.
I will work on a fix - just filing an issue so long for reference.
Reproducible example code
bmerry@cbf8495 adds a unit test that demonstrates the issue. At compile time it warns about returning a reference to a temporary, and at runtime it segfaults.
Required prerequisites
Problem description
I was a bit too clever (or not clever enough) when I refactored make_key_iterator and added make_value_iterator. For a normal, STL iterator everything is fine, but an iterator where dereferencing synthesizes a value on the fly (such as an input iterator) doesn't work correctly (unless it returns a pair of references). Due to some subtleties of
decltype, the accessor functors end up returning a reference to a temporary.I will work on a fix - just filing an issue so long for reference.
Reproducible example code
bmerry@cbf8495 adds a unit test that demonstrates the issue. At compile time it warns about returning a reference to a temporary, and at runtime it segfaults.