Ticket #9648: boost_container_string_assign_optimization_v2.patch

boost/container/string.hpp

@@ -1244 +1244 @@
    basic_string& assign(const CharT* s)
    { return this->assign(s, s + Traits::length(s)); }
 
+   //! <b>Effects</b>: Equivalent to assign(basic_string(first, last)).
+   //!
+   //! <b>Returns</b>: *this
+   basic_string& assign(const CharT* first, const CharT* last)
+   {
+      size_type n = std::distance(first, last);
+      this->reserve(n);
+      CharT* ptr = container_detail::to_raw_pointer(this->priv_addr());
+      Traits::copy(ptr, first, n);
+      this->priv_construct_null(ptr + n);
+      this->priv_size(n);
+      return *this;
+   }
+
    //! <b>Effects</b>: Equivalent to assign(basic_string(n, c)).
    //!
    //! <b>Returns</b>: *this