Boost-Commit mailing page: [Boost-commit] svn:boost r81430

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Subject: [Boost-commit] svn:boost r81430 - trunk/libs/smart_ptr
From: glenfe_at_[hidden]
Date: 2012-11-19 22:00:03

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Author: glenfe
Date: 2012-11-19 22:00:02 EST (Mon, 19 Nov 2012)
New Revision: 81430
URL: http://svn.boost.org/trac/boost/changeset/81430

Log:
Update documentation for make_shared and allocate_shared array forms.
Text files modified:
trunk/libs/smart_ptr/make_shared_array.html | 79 ++++++++++++++++++++++++++++++++++-----
1 files changed, 68 insertions(+), 11 deletions(-)

Modified: trunk/libs/smart_ptr/make_shared_array.html
==============================================================================
--- trunk/libs/smart_ptr/make_shared_array.html (original)
+++ trunk/libs/smart_ptr/make_shared_array.html 2012-11-19 22:00:02 EST (Mon, 19 Nov 2012)
@@ -12,12 +12,14 @@
 <A href="#Synopsis">Synopsis</A> 
 <A href="#functions">Free Functions</A> 
 <A href="#example">Example</A> 
+ History 
 <h2><a name="Introduction">Introduction</a></h2>
- One criticism of Boost shared_array is
- the lack of utility similar to make_shared
- which ensures only a single allocation for an array. A second criticism
- is Boost <code>shared_array</code> does not support custom allocators
- and so also lacks an <code>allocate_shared</code> utility.
+ Originally the Boost function templates <code>make_shared</code> and
+ <code>allocate_shared</code> were for efficient allocation of single
+ objects only. There was a need to have efficient, single, allocation of
+ arrays. One criticism of shared_array was
+ always the lack of a make_shared utility
+ which ensures only a single allocation for an array.
 The header files <boost/smart_ptr/make_shared_array.hpp> and
 <boost/smart_ptr/allocate_shared_array.hpp> provide new function
 templates, <code>make_shared</code> and <code>allocate_shared</code>,
@@ -55,10 +57,10 @@
 shared_ptr<T[N]> make_shared(initializer_list<T> list);

 template<typename T, typename... Args>
- shared_ptr<T[][N]> make_shared(size_t size, initializer_list<T> list);
+ shared_ptr<T[][N]> make_shared(size_t size, initializer_list<T[N]> list);

 template<typename T, typename... Args>
- shared_ptr<T[M][N]> make_shared(initializer_list<T> list);
+ shared_ptr<T[M][N]> make_shared(initializer_list<T[N]> list);

 template<typename T, typename A, typename... Args>
 shared_ptr<T[]> allocate_shared(const A& allocator, initializer_list<T> list);
@@ -67,10 +69,10 @@
 shared_ptr<T[N]> allocate_shared(const A& allocator, initializer_list<T> list);

 template<typename T, typename A, typename... Args>
- shared_ptr<T[][N]> allocate_shared(const A& allocator, size_t size, initializer_list<T> list);
+ shared_ptr<T[][N]> allocate_shared(const A& allocator, size_t size, initializer_list<T[N]> list);

 template<typename T, typename A, typename... Args>
- shared_ptr<T[M][N]> allocate_shared(const A& allocator, initializer_list<T> list);
+ shared_ptr<T[M][N]> allocate_shared(const A& allocator, initializer_list<T[N]> list);
#endif

 template<typename T>
@@ -81,9 +83,9 @@
}</pre>
 <h2><a name="functions">Free Functions</a></h2>
 <pre>template<typename T, typename... Args>
- shared_ptr<T> make_shared(size_t size, Args&&... args);
+ shared_ptr<T[]> make_shared(size_t size, Args&&... args);
template<typename T, typename A, typename... Args>
- shared_ptr<T> allocate_shared(const A& allocator, size_t size, Args&&... args);</pre>
+ shared_ptr<T[]> allocate_shared(const A& allocator, size_t size, Args&&... args);</pre>
 <blockquote>
 Requires: The expression
 <code>new(pointer) T(forward<Args>(args)...)</code>, where
@@ -122,6 +124,58 @@
 take any constructor arguments. These overloads invoke the default
 constructor of <code>T</code> for each array element.
 </blockquote>
+ <pre>template<typename T, typename... Args>
+ shared_ptr<T[N]> make_shared(Args&&... args);
+template<typename T, typename A, typename... Args>
+ shared_ptr<T[N]> allocate_shared(const A& allocator, Args&&... args);</pre>
+ <blockquote>
+ Description: These overloads of the utilities above are for a
+ fixed size array.
+ </blockquote>
+ <pre>template<typename T, typename... Args>
+ shared_ptr<T[]> make_shared(initializer_list<T> list);
+template<typename T, typename A, typename... Args>
+ shared_ptr<T[]> allocate_shared(const A& allocator, initializer_list<T> list);</pre>
+ <blockquote>
+ Description: These overloads initialize the array elements
+ from the initializer list.
+ </blockquote>
+ <pre>template<typename T, typename... Args>
+ shared_ptr<T[N]> make_shared(initializer_list<T> list);
+template<typename T, typename A, typename... Args>
+ shared_ptr<T[N]> allocate_shared(const A& allocator, initializer_list<T> list);</pre>
+ <blockquote>
+ Description: These overloads of the utilities above are for a
+ fixed size array.
+ </blockquote>
+ <pre>template<typename T, typename... Args>
+ shared_ptr<T[][N]> make_shared(size_t size, initializer_list<T[N]> list);
+template<typename T, typename A, typename... Args>
+ shared_ptr<T[][N]> allocate_shared(const A& allocator, size_t size, initializer_list<T[N]> list);</pre>
+ <blockquote>
+ Description: These overloads initialize inner array elements
+ from the initializer list.
+ </blockquote>
+ <pre>template<typename T, typename... Args>
+ shared_ptr<T[M][N]> make_shared(initializer_list<T[N]> list);
+template<typename T, typename A, typename... Args>
+ shared_ptr<T[M][N]> allocate_shared(const A& allocator, initializer_list<T[N]> list);</pre>
+ <blockquote>
+ Description: These overloads of the utilities above are for a
+ fixed size array.
+ </blockquote>
+ <pre>template<typename T>
+ shared_ptr<T[]> make_shared_noinit(size_t size);</pre>
+ <blockquote>
+ Description: This overload does not perform value
+ initialization of elements.
+ </blockquote>
+ <pre>template<typename T>
+ shared_ptr<T[N]> make_shared_noinit();</pre>
+ <blockquote>
+ Description: This overload of the utility above is used for a
+ fixed size array.
+ </blockquote>
 <h2><a name="example">Example</a></h2>
 An example of each overload of make_shared for arrays:
 <blockquote>
@@ -135,6 +189,9 @@
boost::shared_ptr<int[]> a8 = boost::make_shared_noinit<int[]>(size);
boost::shared_ptr<int[5]> a9 = boost::make_shared_noinit<int[5]>();</pre>
 </blockquote>
+ <h2><a name="history">History</a></h2>
+ November 2012. Glen Fernandes contributed implementations of
+ make_shared and allocate_shared for arrays.
 <hr>
 $Date: 2012-10-30 10:12:25 -0800 (Tue, 30 Oct 2012) $
 Copyright 2012 Glen Fernandes. Distributed under the Boost

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