dynamicCast overloads

Synopses

Declared in <bslstl_sharedptr.h>

Return a bsl::shared_ptr<TARGET> object sharing ownership of the same object as the specified source shared pointer to the (template parameter) SOURCE type, and referring to dynamic_cast<TARGET *>(source.get()). If that would return a shared pointer referring to nothing (0 == get()), then instead return an (empty) default constructed shared pointer. Note that a compiler diagnostic will be emitted indicating an error unless dynamic_cast<TARGET *>(source.get()) is a valid expression..

template<
    class TARGET,
    class SOURCE>
static
bsl::shared_ptr<TARGET>
dynamicCast(bsl::shared_ptr<SOURCE> const& source) noexcept;

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Load into the specified target an aliased shared pointer sharing ownership of the object managed by the specified source shared pointer and referring to dynamic_cast<TARGET *>(source.get()). If *target is already managing a (possibly shared) object, then release the shared reference to that object, and destroy it using its associated deleter if that shared pointer held the last shared reference to that object. If 0 == dynamic_cast<TARGET*>(source.get()), then *target shall be reset to an empty state that does not refer to an object. Note that a compiler diagnostic will be emitted indicating an error unless dynamic_cast<TARGET *>(source.get()) is a valid expression.

template<
    class TARGET,
    class SOURCE>
static
void
dynamicCast(
    bsl::shared_ptr<TARGET>* target,
    bsl::shared_ptr<SOURCE> const& source);

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