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Comparison operators for SGSharedPtr

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This commit is contained in:
Thomas Geymayer
2013-04-13 16:20:50 +02:00
parent c2f44a51c4
commit c83dae4c70
1 changed files with 38 additions and 0 deletions
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38
simgear/structure/SGSharedPtr.hxx
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@@ -132,4 +132,42 @@ SGSharedPtr<T> static_pointer_cast(SGSharedPtr<U> const & r)
{
return SGSharedPtr<T>( static_cast<T*>(r.get()) );
}
/**
* Compare two SGSharedPtr<T> objects for equality.
*
* @note Only pointer values are compared, not the actual objects they are
* pointing at.
*/
template<class T, class U>
bool operator==(const SGSharedPtr<T>& lhs, const SGSharedPtr<U>& rhs)
{
return lhs.get() == rhs.get();
}
/**
* Compare two SGSharedPtr<T> objects for equality.
*
* @note Only pointer values are compared, not the actual objects they are
* pointing at.
*/
template<class T, class U>
bool operator!=(const SGSharedPtr<T>& lhs, const SGSharedPtr<U>& rhs)
{
return lhs.get() != rhs.get();
}
/**
* Compare two SGSharedPtr<T> objects for weak ordering.
*
* @note Only pointer values are compared, not the actual objects they are
* pointing at.
* @note This allows using SGSharedPtr as key in associative containers like for
* example std::map and std::set.
*/
template<class T, class U>
bool operator<(const SGSharedPtr<T>& lhs, const SGSharedPtr<U>& rhs)
{
return lhs.get() < rhs.get();
}
#endif