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diff --git a/Examples/go/callback/index.html b/Examples/go/callback/index.html index b053cf547..9a53065b0 100644 --- a/Examples/go/callback/index.html +++ b/Examples/go/callback/index.html @@ -12,67 +12,17 @@ <H2>Implementing C++ callbacks in Go</H2> <p> -This example illustrates how to use directors to implement C++ -callbacks in Go. -</p> - -<p> -Because Go and C++ use inheritance differently, you must call a -different function to create a class which uses callbacks. Instead of -calling the usual constructor function whose name is <tt>New</tt> -followed by the capitalized name of the class, you call a function -named <tt>NewDirector</tt> followed by the capitalized name of the -class. -</p> - -<p> -The first argument to the <tt>NewDirector</tt> function is an instance -of a type. The <tt>NewDirector</tt> function will return an interface -value as usual. However, when calling any method on the returned -value, the program will first check whether the value passed -to <tt>NewDirector</tt> implements that method. If it does, the -method will be called in Go. This is true whether the method is -called from Go code or C++ code. -</p> - -<p> -Note that the Go code will be called with just the Go value, not the -C++ value. If the Go code needs to call a C++ method on itself, you -need to get a copy of the C++ object. This is typically done as -follows: - -<blockquote> -<pre> -type Child struct { abi Parent } -func (p *Child) ChildMethod() { - p.abi.ParentMethod() -} -func f() { - p := &Child{nil} - d := NewDirectorParent(p) - p.abi = d - ... -} -</pre> -</blockquote> - -In other words, we first create the Go value. We pass that to -the <tt>NewDirector</tt> function to create the C++ value; this C++ -value will be created with an association to the Go value. We then -store the C++ value in the Go value, giving us the reverse -association. That permits us to call parent methods from the child. - -</p> - -<p> -To delete a director object, use the function <tt>DeleteDirector</tt> -followed by the capitalized name of the class. +This example illustrates how to use directors to implement C++ callbacks in Go. +See the <a href="../../../Doc/Manual/Go.html#Go_director_classes">Go Director +Classes</a> documentation subsection for an in-depth explanation how to use the +director feature. </p> <p> <ul> -<li><a href="example.h">example.h</a>. Header file containing some enums. -<li><a href="example.i">example.i</a>. Interface file. +<li><a href="example.h">example.h</a>. Header with the definition of the Caller and Callback classes. +<li><a href="example.i">example.i</a>. SWIG interface file. +<li><a href="gocallback.go">gocallback.go</a>. Go source with the definition of the GoCallback class. <li><a href="runme.go">runme.go</a>. Sample Go program. </ul> |