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
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


<code><br />#include &lt;QtConcurrentMap&amp;gt;<br />#include &lt;QVector&amp;gt;
<code>
#include <QtConcurrentMap>
#include <QVector>


#include &lt;boost/bind.hpp&amp;gt;
#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
{
public:
float Test(const Object&amp;amp; object) const { return 1.0f;} // Note, this function MUST be const!
};


int main()<br />{<br /> QVector&amp;amp;lt;Object&amp;amp;gt; v;<br /> Object a;<br /> v.push_back(a);
int main()
{
QVector&amp;amp;lt;Object&amp;amp;gt; v;
Object a;
v.push_back(a);


MyClass myClass;
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));
QVector<float> result = QtConcurrent::blockingMapped<QVector<float> >(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 />}
std::cout << result[0] << std::endl;
return 0;
}

Revision as of 11:16, 25 February 2015

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

  1. include <QtConcurrentMap>
  2. include <QVector>
  1. include <boost/bind.hpp>
  1. include <iostream>

class Object{};

class MyClass { public:

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

};

int main() {

QVector&amp;lt;Object&amp;gt; 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;

}