std::forward_list<T,Allocator>::prepend_range

 

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std::forward_list

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forward_list::front

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forward_list::insert_range_after (C++23)

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forward_list::prepend_range (C++23)

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operator==operator!=operator<operator>operator<=operator>=operator<=> (until C++20)(until C++20)(until C++20)(until C++20)(until C++20)(C++20)

Deduction guides(C++17)

 

template< container-compatible-range<T> R > void prepend_range( R&& rg );		(since C++23)

Inserts, in non-reversing order, copies of elements in rg before begin(). Each iterator in the range rg is dereferenced exactly once.

Parameters

rg	-	a container compatible range, that is, an input_range whose elements are convertible to T.
Type requirements
- T must be EmplaceConstructible into forward_list from *ranges::begin(rg). Otherwise, the behavior is undefined.

Return value

(none)

Complexity

Linear in size of rg.

Notes

Feature-test macro	Value	Std	Comment
__cpp_lib_containers_ranges	202202L	(C++23)	Ranges-aware construction and insertion

Example

Run this code

#include <algorithm>
#include <cassert>
#include <forward_list>
 
int main()
{
    auto data = std::forward_list{0, 1, 2, 3};
    const auto prefix = {-3, -2, -1};
 
#if __cpp_lib_containers_ranges
    data.prepend_range(prefix);
#else
    data.insert_after(data.before_begin(), prefix.begin(), prefix.end());
#endif
    assert(std::ranges::equal(data, std::forward_list{-3, -2, -1, 0, 1, 2, 3}));
}

See also

insert_range (C++23)	inserts a range of elements (public member function)
insert_range_after (C++23)	inserts a range of elements after an element (public member function)
push_front (C++11)	inserts an element to the beginning (public member function)
emplace_front (C++11)	constructs an element in-place at the beginning (public member function)