Default initialization for vector-like containers

Complexity guarantees for associative container constructors and ordered input ranges
Fix for #9166
Added benchmark for associative containers
Removed check for old MSVC compilers and #pragma once.

[SVN r85970]

include/boost/container/map.hpp

@@ -11,7 +11,7 @@
 #ifndef BOOST_CONTAINER_MAP_HPP
 #define BOOST_CONTAINER_MAP_HPP
 
-#if (defined _MSC_VER) && (_MSC_VER >= 1200)
+#if defined(_MSC_VER)
 #  pragma once
 #endif
 
@@ -170,6 +170,8 @@ class map
    //! unique values.
    //!
    //! <b>Complexity</b>: Linear in N.
+   //!
+   //! <b>Note</b>: Non-standard extension.
    template <class InputIterator>
    map( ordered_unique_range_t, InputIterator first, InputIterator last
       , const Compare& comp = Compare(), const allocator_type& a = allocator_type())
@@ -711,7 +713,7 @@ class map
    //!
    //! <b>Complexity</b>: log(size())+count(k)
    size_type count(const key_type& x) const
-   {  return m_tree.find(x) == m_tree.end() ? 0 : 1;  }
+   {  return static_cast<size_type>(m_tree.find(x) != m_tree.end());  }
 
    //! <b>Returns</b>: An iterator pointing to the first element with key not less
    //!   than k, or a.end() if such an element is not found.
@@ -971,6 +973,8 @@ class multimap
    //! <b>Requires</b>: [first ,last) must be ordered according to the predicate.
    //!
    //! <b>Complexity</b>: Linear in N.
+   //!
+   //! <b>Note</b>: Non-standard extension.
    template <class InputIterator>
    multimap(ordered_range_t, InputIterator first, InputIterator last, const Compare& comp = Compare(),
          const allocator_type& a = allocator_type())