boostorg/iterator
1
0
Fork 1
mirror of https://github.com/boostorg/iterator.git synced 2025-11-01 17:01:39 +01:00
Code Issues Packages Projects Releases Wiki Activity

Moved generator_iterator.hpp in iterator directory and modernized.

Browse Source 
generator_iterator now uses decltype approach to deduce value and reference
types instead of the legacy result_type typedef, which was required to be
defined by the generator function.

The default constructor of generator_iterator now value initializes its
data members to avoid using uninitialized data.
This commit is contained in:
Andrey Semashev
2025-02-07 01:12:32 +03:00
parent 6e6def930f
commit d35869cd25
5 changed files with 113 additions and 89 deletions
Download Patch File Download Diff File Expand all files Collapse all files

23
doc/generator_iterator.htm
View File

@@ -15,7 +15,7 @@
<h1>Generator Iterator Adaptor</h1>
<p>Defined in header <a href=
"../../boost/generator_iterator.hpp">boost/generator_iterator.hpp</a></p>
"../../boost/iterator/generator_iterator.hpp">boost/iterator/generator_iterator.hpp</a></p>
<p>The generator iterator adaptor makes it easier to create custom input
iterators from 0-ary functions and function objects. The adaptor takes a
@@ -33,9 +33,7 @@
<blockquote>
<pre>
namespace boost {
template &lt;class Generator&gt;
class generator_iterator_policies;
namespace iterators {
template &lt;class Generator&gt;
class generator_iterator_generator;
@@ -43,6 +41,7 @@ namespace boost {
typename generator_iterator_generator&lt;Generator&gt;::type
make_generator_iterator(Generator &amp; gen);
}
}
</pre>
</blockquote>
<hr>
@@ -60,8 +59,8 @@ template &lt;class Generator&gt;
class generator_iterator_generator
{
public:
typedef <i>unspecified</i> type; // the resulting generator iterator type
}
using type = <i>unspecified</i>; // the resulting generator iterator type
};
</pre>
<h3>Template Parameters</h3>
@@ -78,8 +77,8 @@ public:
"http://www.sgi.com/tech/stl/Generator.html">Generator</a></tt></td>
<td>The generator (0-ary function object) type being wrapped. The
return type of the function must be defined as
<tt>Generator::result_type</tt>. The function object must be a model of
return type of the function is deduced automatically from its
<tt>operator()</tt>. The function object must be a model of
<a href=
"http://www.sgi.com/tech/stl/Generator.html">Generator</a>.</td>
</tr>
@@ -122,14 +121,14 @@ make_generator_iterator(Generator &amp; gen);
<blockquote>
<pre>
#include &lt;iostream&gt;
#include &lt;boost/generator_iterator.hpp&gt;
#include &lt;boost/iterators/generator_iterator.hpp&gt;
class my_generator
{
public:
typedef int result_type;
using result_type = int;
my_generator() : state(0) { }
int operator()() { return ++state; }
result_type operator()() { return ++state; }
private:
int state;
};
@@ -137,7 +136,7 @@ private:
int main()
{
my_generator gen;
boost::generator_iterator_generator&lt;my_generator&gt;::type it = boost::make_generator_iterator(gen);
auto it = boost::iterators::make_generator_iterator(gen);
for(int i = 0; i &lt; 10; ++i, ++it)
std::cout &lt;&lt; *it &lt;&lt; std::endl;
}