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The MemFunSelectArg* functions can be used to select
a specific argument from a signal. For example this would
select the string argument as argument to the callback:
Signal<void, int, float, string> signal;
signal.connect(MemFunSelectArg2(obj, &Object::takesOneStringArg));
signal.emit(10, 3.14, "hello");
...
void Object::takesOneStringArg(const string& value) {
...
}
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For example connecting a function that takes two arguments
to a signal that emits three arguments:
struct Functor {
void show(int a, int b);
};
Functor f;
Signal<void, int, int, int> s3;
s3.connect(MemFunIgnoreArgs(f, &Functor::show));
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This is suppose to replace the obsolete Subject/Observer classes.
See the src/tests/testSignals.cc for basic usage.
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