[flat_tree] insert ordered range doesn't assert sorting

[timblechmann]

void insert(ordered_unique_range_t, InputIterator first, InputIterator last) and friends don't validate that the range is sorted, while the corresponding constructor does.

it would be great if this could be validated. i've done some quick checks with:

diff --git a/include/boost/container/detail/flat_tree.hpp b/include/boost/container/detail/flat_tree.hpp
index 5a14826..bf15564 100644
--- a/include/boost/container/detail/flat_tree.hpp
+++ b/include/boost/container/detail/flat_tree.hpp
@@ -952,20 +952,22 @@ class flat_tree

    //Ordered

    template <class InIt>
    void insert_equal(ordered_range_t, InIt first, InIt last)
    {
+      BOOST_ASSERT((is_sorted)(first, last, this->priv_value_comp()));
       const bool value = boost::container::dtl::
          has_member_function_callable_with_merge_unique<container_type, InIt, InIt, value_compare>::value;
       (flat_tree_merge_equal)(this->m_data.m_seq, first, last, this->priv_value_comp(), dtl::bool_<value>());
    }

    template <class InIt>
    void insert_unique(ordered_unique_range_t, InIt first, InIt last)
    {
+      BOOST_ASSERT((is_sorted)(first, last, this->priv_value_comp()));
       const bool value = boost::container::dtl::
          has_member_function_callable_with_merge_unique<container_type, InIt, InIt, value_compare>::value;
       (flat_tree_merge_unique)(this->m_data.m_seq, first, last, this->priv_value_comp(), dtl::bool_<value>());
    }

    #if !defined(BOOST_NO_CXX11_VARIADIC_TEMPLATES)

which seems to work for me, but i wonder if it may has some unintended side effects?

[igaztanaga]

Many thanks for the suggestion!