bf485df Revert "pass F (functor) by ref/const ref"
e031c53 Revert "pass by const ref in 'apply_const'"
a3014f5 pass by const ref in 'apply_const'
2e0ce4a pass F (functor) by ref/const ref
5875195 add support for 'unwrapping' std::reference_wrapper<T> and accessing std::reference_wrapper<T>::type through get<T>() + update test
c53422f remove boost variant header
5a2d5c5 add reference_wrapper test
git-subtree-dir: third_party/variant
git-subtree-split: bf485dfb59aef26f3ef2183d7c8c1111ad97062b
