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deductiongu...forward_list(3) C++ Standard Libarydeductiongu...forward_list(3) NAME deductionguidesforstd::forward_list - deductionguidesforstd::for- ward_list Synopsis Defined in header <forward_list> template< class InputIt, class Alloc = std::allocator< typename std::iterator_traits<InputIt>::value_type> > (1) (since C++17) forward_list( InputIt, InputIt, Alloc = Alloc() ) -> forward_list<typename std::iterator_traits<InputIt>::value_type, Alloc>; template< ranges::input_range R, class Alloc = std::allocator<ranges::range_value_t<R>> > (2) (since C++23) forward_list( std::from_range_t, R&&, Alloc = Alloc() ) -> forward_list<ranges::range_value_t<R>, Alloc>; 1) This deduction guide is provided for forward_list to allow deduc- tion from an iterator range. This overload participates in overload resolution only if InputIt satisfies LegacyInputIterator and Alloc satisfies Allocator. 2) This deduction guide is provided for forward_list to allow deduc- tion from a std::from_range_t tag and an input_range. Note: the extent to which the library determines that a type does not satisfy LegacyInputIterator is unspecified, except that as a minimum inte- gral types do not qualify as input iterators. Likewise, the extent to which it deter- mines that a type does not satisfy Allocator is unspecified, except that as a minimum the member type Alloc::value_type must exist and the expression std::declval<Alloc&>().allocate(std::size_t{}) must be well-formed when treated as an unevaluated operand. Notes Feature-test macro Value Std Feature __cpp_lib_containers_ranges 202202L (C++23) Ranges-aware construc- tion and insertion; overload (2) Example // Run this code #include <forward_list> #include <vector> int main() { std::vector<int> v = {1, 2, 3, 4}; // uses explicit deduction guide to deduce std::forward_list<int> std::forward_list x(v.begin(), v.end()); // deduces std::forward_list<std::vector<int>::iterator> // first phase of overload resolution for list-initialization se- lects the candidate // synthesized from the initializer-list constructor; second phase is not performed // and deduction guide has no effect std::forward_list y{v.begin(), v.end()}; } http://cppreference.com 2024.06.10 deductiongu...forward_list(3)
NAME | Synopsis | Notes | Example
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