boost/more
1
0
Fork 0
mirror of https://github.com/boostorg/more.git synced 2024-12-27 23:40:13 +08:00
Code Issues Packages Projects Releases Wiki Activity

add fixes from Peter Dimov and Kevlin Henney.

Browse Source 
[SVN r9158]
This commit is contained in:
Dave Abrahams 2001-02-12 14:20:58 +00:00
parent b47d632821
commit fa7687df8b
1 changed files with 18 additions and 10 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

28
generic_programming.html
View File

@ -33,8 +33,9 @@
<h2><a name="traits">Traits</a></h2>
<p>A traits class provides a way of associating information with another
type. For example, the class template <tt><a href=
<p>A traits class provides a way of associating information with a
compile-time entity (a type, integral constant, or address). For example,
the class template <tt><a href=
"http://www.sgi.com/tech/stl/iterator_traits.html">std::iterator_traits&lt;T&gt;</a></tt>
looks something like this:
@ -61,7 +62,7 @@ struct iterator_traits {
are specified for a particular type by (partially) specializing the traits
template.
<p>For an in-depth description of <tt>std::type_traits</tt>, see <a href=
<p>For an in-depth description of <tt>std::iterator_traits</tt>, see <a href=
"http://www.sgi.com/tech/stl/iterator_traits.html">this page</a> provided
by SGI. Another very different expression of the traits idiom in the
standard is <tt>std::numeric_limits&lt;T&gt;</tt> which provides constants
@ -231,12 +232,14 @@ void append_sequence(Container&amp; c, Iterator start, Iterator finish)
<h2><a name="policies">Policies Classes</a></h2>
<p>Policies classes are a simple idea we first saw described by <a href=
"mailto:andrewalex@hotmail.com">Andrei Alexandrescu</a>, but which we
snapped up and quickly applied in the <a href=
"../libs/utility/iterator_adaptors.htm">Iterator Adaptors</a> library. A
policies class is a template parameter used to transmit behaviors. A
detailed description by Andrei is available in <a href=
<p>A policies class is a template parameter used to transmit
behaviors. An example from the standard library is <tt>std::<a
href="http://www.dinkumware.com/htm_cpl/memory.html#allocator"></a></tt>,
which supplies memory management behaviors to standard <a
href="http://www.sgi.com/tech/stl/Container.html">containers</a>.
<p>Policies classes have been explored in detail by <a href=
"mailto:andrewalex@hotmail.com">Andrei Alexandrescu</a> in <a href=
"http://www.cs.ualberta.ca/~hoover/cmput401/XP-Notes/xp-conf/Papers/7_3_Alexandrescu.pdf">
this paper</a>. He writes:
@ -257,7 +260,12 @@ void append_sequence(Container&amp; c, Iterator start, Iterator finish)
from their granularity and orthogonality. Boost has probably diluted the
distinction in the <a href="../libs/utility/iterator_adaptors.htm">Iterator
Adaptors</a> library, where we transmit all of an adapted iterator's
behavior in a single policies class.
behavior in a single policies class. There is precedent for this, however:
<tt><a
href="http://www.dinkumware.com/htm_cpl/string2.html#char_traits">std::char_traits</a></tt>,
despite its name, acts as a policies class that determines the behaviors of
<a
href="http://www.dinkumware.com/htm_cpl/string2.html#basic_string">std::basic_string</a>.
<h2><a name="adaptors">Adaptors</a></h2>