std::basic_stacktrace<Allocator>::operator=
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< cpp | utility | basic stacktrace
basic_stacktrace& operator=( const basic_stacktrace& other ); |
(1) | (since C++23) |
basic_stacktrace& operator=( basic_stacktrace&& other ) noexcept(/* see below */); |
(2) | (since C++23) |
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)
|| 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.requirements.general]/12, and a more direct guarantee is under consideration via LWG 2321.
Example
This section is incomplete Reason: no example |
See also
(C++23) |
creates a new basic_stacktrace (public member function) |