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821. Minor cleanup : unique_ptr

Section: 20.3.1.4.5 [unique.ptr.runtime.modifiers] Status: C++11 Submitter: Alisdair Meredith Opened: 2008-03-30 Last modified: 2016-01-28

Priority: Not Prioritized

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Discussion:

Reading resolution of LWG issue 673⁽ⁱ⁾ I noticed the following:

void reset(T* pointer p = 0 pointer());

-1- Requires: Does not accept pointer types which are convertible to T* pointer (diagnostic required). [Note: One implementation technique is to create a private templated overload. -- end note]

This could be cleaned up by mandating the overload as a public deleted function. In addition, we should probably overload reset on nullptr_t to be a stronger match than the deleted overload. Words...

Proposed resolution:

Add to class template definition in 20.3.1.4 [unique.ptr.runtime]

// modifiers 
pointer release(); 
void reset(pointer p = pointer()); 
void reset( nullptr_t );
template< typename U > void reset( U ) = delete;
void swap(unique_ptr&& u);

Update 20.3.1.4.5 [unique.ptr.runtime.modifiers]

void reset(pointer p = pointer());
void reset(nullptr_t);

-1- Requires: Does not accept pointer types which are convertible to pointer (diagnostic required). [Note: One implementation technique is to create a private templated overload. -- end note]

Effects: If get() == nullptr there are no effects. Otherwise get_deleter()(get()).

...

[ Note this wording incorporates resolutions for 806⁽ⁱ⁾ (New) and 673⁽ⁱ⁾ (Ready). ]