Forced KeyOfValue creation when using custom compare on insert_check

[kiril.dimitroff@…]

Introducing key_of_value in 1.59 seems to have broken the custom compare feature (including subsequent versions):

    int first;
    explicit MyClass(int i) : first(i){}

Compr defines strict ordering between MyClass and int.

    typedef set< MyClass, compare<MyClass::Compr> > OrderedMap;

    ...

    int i = 1;
    auto ret = omap.insert_check(i, omap.value_comp(), commit_data);

triggers the following error:

boost_1_59_0/boost/intrusive/detail/tree_value_compare.hpp:64:26: error: no match for call to ‘(boost::move_detail::identity<MyClass>) (const int&)’

{ return KeyOfValue()(key); }

using gcc-5.4

Full snippet attached

[kiril.dimitroff@…]

full code snippet

[Ion Gaztañaga]

Thanks for the report and the test case. Fixed in commit:

​https://github.com/boostorg/intrusive/commit/9ac060a6aeb9dfd1a0bc0c70639d13dcc30258de

hopefully will be ready for Boost 1.62.