36 lines
778 B
C++
36 lines
778 B
C++
#ifndef GRAPHICSOBJECT_H
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#define GRAPHICSOBJECT_H
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class GraphicsObject
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{
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public:
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// 2nd arg: pointer to callback function that takes a reference to an int as an argument
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GraphicsObject(int set_x)
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{
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x = set_x;
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user_data = NULL;
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callback = NULL; // function pointer
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}
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GraphicsObject(void (*set_callback)(int&, void*), void *set_user_data)
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{
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x = 0;
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user_data = set_user_data;
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callback = set_callback; // function pointer
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}
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int X()
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{
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// If you are SUPPOSED to callback, ...
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if(callback)
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// ... do so to ask for the new X value
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callback(x, user_data);
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return x; // either this was just set by callback, or it was always set by constructor.
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}
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//private:
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int x;
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void *user_data;
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private:
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void (*callback)(int&, void*);
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};
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#endif
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