shareable.cpp

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#ifndef Om_Shareable_
 
    #include "om/shareable.hpp"
 
#else
 
    #ifndef Om_Macro_Precompilation_
 
        #include <stdexcept>
        #include "boost/checked_delete.hpp"
        #include "boost/integer_traits.hpp"
 
    #endif
 
// MARK: - Om::Shareable
 
    #define Template_ \
    template <typename ThisOwnerCount>
 
    #define Type_ \
    Om::Shareable<ThisOwnerCount>
 
// MARK: public (non-static)
 
Template_
inline Type_::~Shareable() {
    assert(
        !this->thisOwnerCount &&
        "Non-zero owner count."
    );
}
 
Template_
inline ThisOwnerCount Type_::GetOwnerCount() const {
    return this->thisOwnerCount;
}
 
// MARK: protected (non-static)
 
Template_
inline Type_::Shareable():
thisOwnerCount() {}
 
Template_
inline Type_::Shareable(Shareable const &):
thisOwnerCount() {}
 
Template_
inline Type_ & Type_::operator =(Shareable const &) {
    return *this;
}
 
// MARK: private (non-static)
 
Template_
inline void Type_::DecrementOwnerCount() {
    assert(
        this->thisOwnerCount &&
        "Owner count underflow."
    );
    --this->thisOwnerCount;
}
 
Template_
inline void Type_::IncrementOwnerCount() {
    if (
        boost::integer_traits<ThisOwnerCount>::const_max == this->thisOwnerCount
    ) {
        throw std::overflow_error("Owner count overflow.");
    }
    ++this->thisOwnerCount;
}
 
    #undef Type_
    #undef Template_
 
// MARK: - Om::
 
template <typename TheOwnerCount>
inline void Om::intrusive_ptr_add_ref(
    Shareable<TheOwnerCount> * const thePointee
) {
    assert(
        thePointee &&
        "The pointer cannot be null."
    );
    thePointee->IncrementOwnerCount();
}
 
template <typename TheOwnerCount>
inline void Om::intrusive_ptr_release(
    Shareable<TheOwnerCount> * const thePointee
) {
    assert(
        thePointee &&
        "The pointer cannot be null."
    );
    thePointee->DecrementOwnerCount();
    if (!thePointee->thisOwnerCount) {
        boost::checked_delete(thePointee);
    }
}
 
#endif