lazy.qh

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#pragma once

#include "oo.qh"

CLASS(Lazy, Object)
    ATTRIB(Lazy, m_get, entity());
    CONSTRUCTOR(Lazy, entity() _compute)
    {
        this.m_get = _compute;
    }
ENDCLASS(Lazy)

#define LAZY(id) __lazy_##id
#define LAZY_NEW(id, compute) \
    entity LAZY(id)() { \
        static bool done; \
        static entity it; \
        if (!done) { it = compute; done = true; } \
        return it; \
    }