syntax help : m_button.signal_clicked().connect(sigc:...

This is a discussion on syntax help : m_button.signal_clicked().connect(sigc:... within the C++ Programming forums, part of the General Programming Boards category; Hi. Will someone educate me on the correct terms/words for the following syntax so I can google for more info. ...

  1. #1
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    syntax help : m_button.signal_clicked().connect(sigc:...

    Hi.

    Will someone educate me on the correct terms/words for the following syntax so I can google for more info.

    Code:
    ().connect(
    in:

    Code:
    m_button.signal_clicked().connect(sigc::mem_fun(*this,&HelloWorld::on_button_clicked));
    I understand what this does, establish the connection. But a reference to a guide with some examples and explanations on the syntax would be great.

    thx

  2. #2
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    Code:
    m_button.signal_clicked()
    This means: call member function signal_clicked() of class m_button.

    signal_clicked() returns an object of a class with a memberfunction named connect(). Is that correct? If I'm right about that, then is there a name for this syntax? I would like to read more about this syntax.

  3. #3
    C++ Witch laserlight's Avatar
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    Quote Originally Posted by Mannic
    This means: call member function signal_clicked() of class m_button.
    Almost, except that m_button is an object, not a class.

    Quote Originally Posted by Mannic
    signal_clicked() returns an object of a class with a memberfunction named connect(). Is that correct?
    Yes.

    Quote Originally Posted by Mannic
    If I'm right about that, then is there a name for this syntax?
    I call it function (or function call) chaining.
    Quote Originally Posted by Bjarne Stroustrup (2000-10-14)
    I get maybe two dozen requests for help with some sort of programming or design problem every day. Most have more sense than to send me hundreds of lines of code. If they do, I ask them to find the smallest example that exhibits the problem and send me that. Mostly, they then find the error themselves. "Finding the smallest program that demonstrates the error" is a powerful debugging tool.
    Look up a C++ Reference and learn How To Ask Questions The Smart Way

  4. #4
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    Thanks, exactly what I needed.

    I found an example here. Easy to understand, and just as expected.

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