NAME¶

std::basic_stacktrace::operator= - std::basic_stacktrace::operator=

Synopsis¶

basic_stacktrace& operator=( const basic_stacktrace& other ); (1) (since C++23)
basic_stacktrace& operator=( basic_stacktrace&& other ) (2) (since C++23)
noexcept(/* see below */);

Replaces the contents of the basic_stacktrace.

1) Copy assignment operator. Replaces the contents with a copy of the contents of
other.
If
std::allocator_traits<allocator_type>::propagate_on_container_copy_assignment::value
is true, the allocator of *this is replaced by a copy of that of other. If the
allocator of *this after assignment would compare unequal to its old value, the old
allocator is used to deallocate the memory, then the new allocator is used to
allocate it before copying the entries. Otherwise, the memory owned by *this may be
reused when possible.
2) Move assignment operator. Replaces the contents with those of other using move
semantics (i.e. the data in other is moved from other into *this). other is in a
valid but unspecified state afterwards.
If
std::allocator_traits<allocator_type>::propagate_on_container_move_assignment::value
is true, the allocator of *this is replaced by a copy of that of other. If it is
false and the allocators of *this and other do not compare equal, *this cannot take
ownership of the memory owned by other and must assign each entries individually,
allocating additional memory using its own allocator as needed.

In any case, the stacktrace entries originally belong to *this may be either
destroyed or replaced by element-wise assignment.

*this may be set to empty on allocation failure if the implementation strengthens
the exception specification.

Parameters¶

other - another basic_stacktrace to use as source

Return value¶

*this

Complexity¶

1) Linear in the size of *this and other.
2) Linear in the size of *this unless the allocators do not compare equal and do not
propagate, in which case linear in the size of *this and other.

Exceptions¶

1) May throw implementation-defined exceptions.
2)
noexcept specification:
noexcept(std::allocator_traits<Allocator>::propagate_on_container_move_assignment::value
|| std::allocator_traits<Allocator>::is_always_equal::value)

Notes¶

After container move assignment (overload (2)), unless element-wise move assignment
is forced by incompatible allocators, references, pointers, and iterators (other
than the end iterator) to other remain valid, but refer to elements that are now in
*this. The current standard makes this guarantee via the blanket statement in
[container.reqmts]/67, and a more direct guarantee is under consideration via LWG
issue 2321.

Example¶

This section is incomplete
Reason: no example

See also¶

constructor creates a new basic_stacktrace
(public member function)

Categories:¶

* conditionally noexcept
* Todo no example