QtConcurrent-BlockingMapped-Other-Object-Member-Function-Bind: Difference between revisions

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Demonstrates how to pass each object in the container to a member function of different class instance using boost::bind. You can alternatively do this by overloading "operator()":http://developer.qt.nokia.com/wiki/QtConcurrent-BlockingMapped-Other-Object-Member-Function-Operator
[[Category:HowTo]]
This demonstrates how to pass each object in the container to a member function of different class instance using boost::bind. You can alternatively do this by overloading [[QtConcurrent-BlockingMapped-Other-Object-Member-Function-Operator | operator()]]


<code><br />#include &lt;QtConcurrentMap&amp;gt;<br />#include &lt;QVector&amp;gt;
<code>
 
#include <QtConcurrentMap>
#include &lt;boost/bind.hpp&amp;gt;
#include <QVector>
 
#include <boost/bind.hpp>
#include &lt;iostream&amp;gt;
#include <iostream>


class Object{};
class Object{};


class MyClass<br />{<br />public:<br /> float Test(const Object&amp;amp; object) const { return 1.0f;} // Note, this function MUST be const!<br />};
class MyClass
 
{
int main()<br />{<br /> QVector&amp;amp;lt;Object&amp;amp;gt; v;<br /> Object a;<br /> v.push_back(a);
public:
 
float Test(const Object& object) const { return 1.0f; } // Note, this function MUST be const!
MyClass myClass;
};
 
QVector&amp;lt;float&amp;gt; result = QtConcurrent::blockingMapped&amp;lt;QVector&amp;lt;float&amp;gt; &gt;(v.begin(), v.end(), boost::bind(&amp;MyClass::Test, &amp;myClass, _1));


std::cout &lt;&lt; result[0] &lt;&lt; std::endl;<br /> return 0;<br />}
int main()
{
QVector<Object> v;
Object a;
v.push_back(a);
MyClass myClass;
QVector<float> result = QtConcurrent::blockingMapped<QVector<float> >(v.begin(), v.end(), boost::bind(&MyClass::Test, &myClass, _1));
std::cout << result[0] << std::endl;
return 0;
}
</code>

Latest revision as of 02:14, 18 May 2017

This demonstrates how to pass each object in the container to a member function of different class instance using boost::bind. You can alternatively do this by overloading operator()

#include <QtConcurrentMap>
#include <QVector>
#include <boost/bind.hpp>
#include <iostream>

class Object{};

class MyClass
{
public:
 float Test(const Object& object) const { return 1.0f; } // Note, this function MUST be const!
};

int main()
{
 QVector<Object> v;
 Object a;
 v.push_back(a);
 MyClass myClass;
 QVector<float> result = QtConcurrent::blockingMapped<QVector<float> >(v.begin(), v.end(), boost::bind(&MyClass::Test, &myClass, _1));
 std::cout << result[0] << std::endl;
 return 0;
}