URL:
<http://gna.org/patch/?7490>
Summary: Qt client: Add class to ease wrapping the C API
Project: Freeciv
Submitted by: louis94
Submitted on: jeu. 21 juil. 2016 01:46:45 UTC
Category: client-qt
Priority: 5 - Normal
Status: None
Privacy: Public
Assigned to: None
Originator Email:
Open/Closed: Open
Discussion Lock: Any
Planned Release:
Contains string changes: None
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Details:
The attached file adds a new template class designed to wrap the C API in an
event-like interface. Creating a wrapper is simple (declare an abstract class,
add a macro to .cpp). Subscribing to events is done through inheritance.
Excerpt from the doc:
This class is a helper to create Java-like "listeners" for "events" generated
in C code. If the C interface defines a callback foo() and you want to use it
as an event, you first declare a C++ interface:
class foo_helper : public helper<foo_helper>
{
public:
virtual void foo() = 0;
};
The helper needs some static data. Declaring it is as simple as putting a
macro in some source file:
CPP_DECLARE_HELPER(foo_helper)
Then, you call the listeners from the implementation of the C interface:
void foo()
{
foo_helper::invoke(&foo_helper::foo);
}
This will invoke foo() on all foo_helper objects. It does also work for
derived classes.
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File Attachments:
-------------------------------------------------------
Date: jeu. 21 juil. 2016 01:46:45 UTC Name: cpputils.h Size: 5 ko By:
louis94
<http://gna.org/patch/download.php?file_id=27965>
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Reply to this item at:
<http://gna.org/patch/?7490>
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