function

See also: function class reference.

The function class can be used to apply a function to an incoming signal and output the result. function is a modifier with the Modifier set to an adapter for the provided function.

Table 1.17. function class use example

fused

unfused

signals::function<void (float), float(float), signals::fused>
    double_fun1(boost::bind(std::multiplies<float>(), _1, 2.0f));
signals::function<void (float), float(float), signals::fused>
    double_fun2(boost::bind(std::multiplies<float>(), _1, 2.0f));
signals::storage<void (float), signals::fused> floater(1.0f);
signals::storage<void (float), signals::fused> collector(0.0f);

floater >>= double_fun1 >>= double_fun2 >>= collector;
floater.send();

BOOST_CHECK_EQUAL(collector.at<0>(), 4.0f);

signals::function<void (float), float(float), signals::unfused>
    double_fun1(boost::bind(std::multiplies<float>(), _1, 2.0f));
signals::function<void (float), float(float), signals::unfused>
    double_fun2(boost::bind(std::multiplies<float>(), _1, 2.0f));
signals::storage<void (float), signals::unfused> floater(1.0f);
signals::storage<void (float), signals::unfused> collector(0.0f);

floater >>= double_fun1 >>= double_fun2 >>= collector;
floater.send();

BOOST_CHECK_EQUAL(collector.at<0>(), 4.0f);