Callback
Basic Callbacks
main.cpp
#include <Core/Core.h>
using namespace Upp;
struct Foo {
int x;
void Action() { Cout() << "Action: " << x << '\n'; }
void ActionWithParam(int y) { Cout() << "ActionWithParam: " << x + y << '\n'; }
Callback WhenDo;
void Do() { WhenDo(); }
Foo(int x = 0) : x(x) {}
};
void Fn()
{
Cout() << "Fn!" << '\n';
}
struct Bar {
Foo foo;
void Action() { Cout() << "foo's Do called\n"; }
typedef Bar CLASSNAME;
Bar() { foo.WhenDo = THISBACK(Action); }
};
struct Safe : Pte<Safe> {
void Action() { Cout() << "safe action!\n"; }
};
CONSOLE_APP_MAIN
{
Foo a(10);
Callback cb1 = callback(&a, &Foo::Action);
Callback cb2 = callback(Fn);
Callback1<int> cb3 = callback(&a, &Foo::ActionWithParam);
Callback cb4 = callback1(&a, &Foo::ActionWithParam, 30);
cb1();
cb2();
cb3(10);
cb4();
Cout() << "---------\n";
cb4 << cb2;
cb4();
Cout() << "---------\n";
Bar b;
b.foo.Do();
Cout() << "---------\n";
{
Safe f;
cb4 = pteback(&f, &Safe::Action);
Cout() << "callback valid: " << (bool)cb4 << '\n';
cb4();
}
Cout() << "callback valid: " << (bool)cb4 << '\n';
cb4();
}
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