std::raw_storage_iterator
From cppreference.com
Defined in header <memory>
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template< class OutputIt, class T > class raw_storage_iterator |
(until C++17) | |
template< class OutputIt, class T > class raw_storage_iterator; |
(since C++17) (deprecated) (removed in C++20) |
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The output iterator std::raw_storage_iterator
makes it possible for standard algorithms to store results in uninitialized memory. Whenever the algorithm writes an object of type T
to the dereferenced iterator, the object is copy-constructed into the location in the uninitialized storage pointed to by the iterator. The template parameter OutputIt
is any type that meets the requirements of OutputIterator and has operator* defined to return an object, for which operator& returns an object of type T*
. Usually, the type T*
is used as OutputIt
.
Type requirements
-OutputIt must meet the requirements of OutputIterator.
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Member functions
creates a new raw_storage_iterator (public member function) | |
constructs an object at the pointed-to location in the buffer (public member function) | |
dereferences the iterator (public member function) | |
advances the iterator (public member function) | |
(since C++17) |
provides access to the wrapped iterator (public member function) |
Member types
Member type | Definition |
value_type
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void |
difference_type
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void |
pointer
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void |
reference
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void |
iterator_category
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std::output_iterator_tag |
These member types are required to be obtained by inheriting from std::iterator<std::output_iterator_tag,void,void,void,void>. |
(until C++17) |
Example
Run this code
#include <iostream> #include <string> #include <memory> #include <algorithm> int main() { const std::string s[] = {"This", "is", "a", "test", "."}; std::string* p = std::get_temporary_buffer<std::string>(5).first; std::copy(std::begin(s), std::end(s), std::raw_storage_iterator<std::string*, std::string>(p)); for(std::string* i = p; i!=p+5; ++i) { std::cout << *i << '\n'; i->~basic_string<char>(); } std::return_temporary_buffer(p); }
Output:
This is a test .
See also
(C++11) |
provides information about allocator types (class template) |
(C++11) |
implements multi-level allocator for multi-level containers (class template) |
(C++11) |
checks if the specified type supports uses-allocator construction (class template) |