counted.h

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#ifndef GEOGRAM_BASIC_COUNTED
#define GEOGRAM_BASIC_COUNTED
 
#include <geogram/basic/common.h>
#include <geogram/basic/smart_pointer.h>
#include <geogram/basic/assert.h>
 
namespace GEO {
 
    class GEOGRAM_API Counted {
    public:
    void ref() const {
        ++nb_refs_;
    }
 
    void unref() const {
        --nb_refs_;
        geo_debug_assert(nb_refs_ >= 0);
        if(nb_refs_ == 0) {
            delete this;
        }
    }
 
    bool is_shared() const {
        return nb_refs_ > 1;
    }
 
    int nb_refs() const {
        return nb_refs_;
    }
 
    static void ref(const Counted* counted) {
        if(counted != nullptr) {
            counted->ref();
        }
    }
 
    static void unref(const Counted* counted) {
        if(counted != nullptr) {
            counted->unref();
        }
    }
 
    protected:
    Counted() :
    nb_refs_(0) {
    }
 
    virtual ~Counted();
 
    private:
    Counted(const Counted&);
    Counted& operator= (const Counted&);
 
    mutable int nb_refs_;
    };
}
 
#endif