Subject: [Boost-commit] svn:boost r52463 - trunk/libs/utility
From: d.frey_at_[hidden]
Date: 2009-04-18 05:06:31
Author: daniel_frey
Date: 2009-04-18 05:06:31 EDT (Sat, 18 Apr 2009)
New Revision: 52463
URL: http://svn.boost.org/trac/boost/changeset/52463
Log:
primary operand type must be class type, see ticket #2938
Text files modified:
trunk/libs/utility/operators.htm | 55 +++++++++++++++++++++------------------
1 files changed, 29 insertions(+), 26 deletions(-)
Modified: trunk/libs/utility/operators.htm
==============================================================================
--- trunk/libs/utility/operators.htm (original)
+++ trunk/libs/utility/operators.htm 2009-04-18 05:06:31 EDT (Sat, 18 Apr 2009)
@@ -132,18 +132,18 @@
class MyInt
: boost::operators<MyInt>
{
- bool operator<(const MyInt& x) const;
+ bool operator<(const MyInt& x) const;
bool operator==(const MyInt& x) const;
- MyInt& operator+=(const MyInt& x);
- MyInt& operator-=(const MyInt& x);
- MyInt& operator*=(const MyInt& x);
- MyInt& operator/=(const MyInt& x);
- MyInt& operator%=(const MyInt& x);
- MyInt& operator|=(const MyInt& x);
- MyInt& operator&=(const MyInt& x);
- MyInt& operator^=(const MyInt& x);
- MyInt& operator++();
- MyInt& operator--();
+ MyInt& operator+=(const MyInt& x);
+ MyInt& operator-=(const MyInt& x);
+ MyInt& operator*=(const MyInt& x);
+ MyInt& operator/=(const MyInt& x);
+ MyInt& operator%=(const MyInt& x);
+ MyInt& operator|=(const MyInt& x);
+ MyInt& operator&=(const MyInt& x);
+ MyInt& operator^=(const MyInt& x);
+ MyInt& operator++();
+ MyInt& operator--();
};
</pre>
</blockquote>
@@ -345,7 +345,7 @@
</ul>
<p>As Daniel Krügler pointed out, this technique violates 14.6.5/2
- and is thus non-portable. The reasoning is, that the operators injected
+ and is thus non-portable. The reasoning is, that the operators injected
by the instantiation of e.g.
<code>less_than_comparable<myclass></code> can not be found
by ADL according to the rules given by 3.4.2/2, since myclass is
@@ -445,6 +445,9 @@
optional template parameter <code>B</code>, which is not shown, for the
<a href="#chaining">base class chaining</a> technique.</p>
+ <p>The primary operand type <code>T</code> needs to be of class type,
+ built-in types are not supported.</p>
+
<table cellpadding="5" border="1" align="center">
<caption>
Simple Arithmetic Operator Template Classes
@@ -917,7 +920,7 @@
created, <code>operator+=</code> is called on it and it is copied to the
function return value (which is another unnamed object of type
<code>T</code>). The standard doesn't generally allow the intermediate
- object to be optimized away:
+ object to be optimized away:
<blockquote>
3.7.2/2: Automatic storage duration<br>
@@ -928,7 +931,7 @@
unused, except that a class object or its copy may be eliminated as
specified in 12.8.
</blockquote>
- The reference to 12.8 is important for us:
+ The reference to 12.8 is important for us:
<blockquote>
12.8/15: Copying class objects<br>
@@ -942,7 +945,7 @@
</blockquote>
This optimization is known as the named return value optimization (NRVO),
which leads us to the following implementation for
- <code>operator+</code>:
+ <code>operator+</code>:
<pre>
T operator+( const T& lhs, const T& rhs )
{
@@ -956,7 +959,7 @@
even implement it in an incorrect way which makes it useless here.
Without the NRVO, the NRVO-friendly code is no worse than the original
code showed above, but there is another possible implementation, which
- has some very special properties:
+ has some very special properties:
<pre>
T operator+( T lhs, const T& rhs )
{
@@ -982,7 +985,7 @@
will force the NRVO-friendly implementation to be used even for compilers
that don't implement the NRVO. <br>
<br>
-
+
<h3><a name="grpd_oprs">Grouped Arithmetic Operators</a></h3>
<p>The following templates provide common groups of related operations.
@@ -1864,7 +1867,7 @@
V, D, P, R></a></code></td>
<td>
- Supports the operations and has the requirements of
+ Supports the operations and has the requirements of
<ul>
<li><code><a href="#input_iteratable">input_iteratable<T,
@@ -1878,7 +1881,7 @@
"output_iterator_helper">output_iterator_helper<T></a></code></td>
<td>
- Supports the operations and has the requirements of
+ Supports the operations and has the requirements of
<ul>
<li><code><a href=
@@ -1894,7 +1897,7 @@
R></a></code></td>
<td>
- Supports the operations and has the requirements of
+ Supports the operations and has the requirements of
<ul>
<li><code><a href="#forward_iteratable">forward_iteratable<T,
@@ -1909,7 +1912,7 @@
V, D, P, R></a></code></td>
<td>
- Supports the operations and has the requirements of
+ Supports the operations and has the requirements of
<ul>
<li><code><a href=
@@ -1925,7 +1928,7 @@
V, D, P, R></a></code></td>
<td>
- Supports the operations and has the requirements of
+ Supports the operations and has the requirements of
<ul>
<li><code><a href=
@@ -1976,8 +1979,8 @@
template<typename T>
function_output_iterator& operator=(T const& value)
{
- this->func(value);
- return *this;
+ this->func(value);
+ return *this;
}
private:
@@ -2130,8 +2133,8 @@
<p>Revised: 7 Aug 2008</p>
<p>Copyright © Beman Dawes, David Abrahams, 1999-2001.</p>
- <p>Copyright © Daniel Frey, 2002-2008.</p>
- <p>Use, modification, and distribution is subject to the Boost Software
+ <p>Copyright © Daniel Frey, 2002-2009.</p>
+ <p>Use, modification, and distribution is subject to the Boost Software
License, Version 1.0. (See accompanying file
<a href="../../LICENSE_1_0.txt">LICENSE_1_0.txt</a> or copy at
<a href="http://www.boost.org/LICENSE_1_0.txt">