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/static_vector.hpp

@@ -10,7 +10,7 @@
 #ifndef BOOST_CONTAINER_STATIC_VECTOR_HPP
 #define BOOST_CONTAINER_STATIC_VECTOR_HPP
 
-#if (defined _MSC_VER) && (_MSC_VER >= 1200)
+#if defined(_MSC_VER)
 #  pragma once
 #endif
 
@@ -138,7 +138,7 @@ public:
 
     //! @pre <tt>count <= capacity()</tt>
     //!
-    //! @brief Constructs a static_vector containing count default constructed Values.
+    //! @brief Constructs a static_vector containing count value initialized values.
     //!
     //! @param count    The number of values which will be contained in the container.
     //!
@@ -151,6 +151,24 @@ public:
         : base_t(count)
     {}
 
+    //! @pre <tt>count <= capacity()</tt>
+    //!
+    //! @brief Constructs a static_vector containing count value initialized values.
+    //!
+    //! @param count    The number of values which will be contained in the container.
+    //!
+    //! @par Throws
+    //!   If Value's default constructor throws.
+    //!
+    //! @par Complexity
+    //!   Linear O(N).
+    //!
+    //! @par Note
+    //!   Non-standard extension
+    static_vector(size_type count, default_init_t)
+        : base_t(count, default_init_t())
+    {}
+
     //! @pre <tt>count <= capacity()</tt>
     //!
     //! @brief Constructs a static_vector containing count copies of value.
@@ -358,7 +376,7 @@ public:
     //! @pre <tt>count <= capacity()</tt>
     //!
     //! @brief Inserts or erases elements at the end such that
-    //!   the size becomes count. New elements are default constructed.
+    //!   the size becomes count. New elements are value initialized.
     //!
     //! @param count    The number of elements which will be stored in the container.
     //!
@@ -369,6 +387,23 @@ public:
     //!   Linear O(N).
     void resize(size_type count);
 
+    //! @pre <tt>count <= capacity()</tt>
+    //!
+    //! @brief Inserts or erases elements at the end such that
+    //!   the size becomes count. New elements are default initialized.
+    //!
+    //! @param count    The number of elements which will be stored in the container.
+    //!
+    //! @par Throws
+    //!   If Value's default constructor throws.
+    //!
+    //! @par Complexity
+    //!   Linear O(N).
+    //!
+    //! @par Note
+    //!   Non-standard extension
+    void resize(size_type count, default_init_t);
+
     //! @pre <tt>count <= capacity()</tt>
     //!
     //! @brief Inserts or erases elements at the end such that