[bimap][PR RFC] Add std::initializer_list constructor

From: Hu Jialun (hujialun_at_[hidden])
Date: 2021-07-23 06:17:09

C++11 allows list initialization for classes. STL map has been added
a constructor with the signature

    map(initializer_list<value_type> il,
        const allocator_type& alloc = allocator_type());

Added a similar constructor to bimap, allowing for initialization in the
form of initializer list, such as

    boost::bimap<double, long> tdn {
        {114.514, 1919},
        {891.931, 810}
    };
---
Seems that the pull request is not being seen for a while...
Could someone please take a quick look at it and possibly give some
directions? :)
https://github.com/boostorg/bimap/pull/31
 include/boost/bimap/bimap.hpp | 23 +++++++++++++++++++++++
 1 file changed, 23 insertions(+)
diff --git a/include/boost/bimap/bimap.hpp b/include/boost/bimap/bimap.hpp
index 5fe7a3f..a3603e5 100644
--- a/include/boost/bimap/bimap.hpp
+++ b/include/boost/bimap/bimap.hpp
@@ -265,6 +265,29 @@ class bimap
 
    {}
 
+   #ifndef BOOST_NO_CXX11_HDR_INITIALIZER_LIST
+   bimap(std::initializer_list<BOOST_DEDUCED_TYPENAME base_::core_type::value_type> init,
+         const allocator_type& al = allocator_type()) :
+
+       base_::relation_set(
+           ::boost::multi_index::get<
+               BOOST_DEDUCED_TYPENAME base_::logic_relation_set_tag>(core)
+       ),
+
+       core(init,ctor_args_list(),al),
+
+       left (
+           ::boost::multi_index::get<
+               BOOST_DEDUCED_TYPENAME base_::logic_left_tag>(core)
+       ),
+       right (
+           ::boost::multi_index::get<
+               BOOST_DEDUCED_TYPENAME base_::logic_right_tag>(core)
+       )
+
+   {}
+   #endif
+
    bimap(const bimap& x) :
 
        base_::relation_set(