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deductiongu...rstd::deque(3) C++ Standard Libary deductiongu...rstd::deque(3) NAME deductionguidesforstd::deque - deductionguidesforstd::deque Synopsis Defined in header <deque> template< class InputIt, class Alloc = std::allocator<typename std::iterator_traits<InputIt>::value_type>> (since C++17) deque(InputIt, InputIt, Alloc = Alloc()) -> deque<typename std::iterator_traits<InputIt>::value_type, Alloc>; This deduction guide is provided for deque to allow deduction from an iterator range. This overload participates in overload resolution only if In- putIt satisfies LegacyInputIterator and Alloc satisfies Allocator. 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. Example // Run this code #include <deque> #include <vector> int main() { std::vector<int> v = {1, 2, 3, 4}; // uses explicit deduction guide to deduce std::deque<int> std::deque x(v.begin(), v.end()); // deduces std::deque<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::deque y{v.begin(), v.end()}; } http://cppreference.com 2022.07.31 deductiongu...rstd::deque(3)
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