std::basic_string_view
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Defined in header <string_view> | ||
template<class It,class End> basic_string_view( It, End)-> basic_string_view<std::iter_value_t<It>>; | (1) | (since C++20) |
template<class R> basic_string_view( R&&)-> basic_string_view<ranges::range_value_t<R>>; | (2) | (since C++23) |
Thesededuction guides are provided forstd::basic_string_view.
It satisfiescontiguous_iterator andEnd satisfiessized_sentinel_for forIt.R satisfiescontiguous_range.#include <array>#include <iostream>#include <string_view> int main(){std::array a1{'n','u','c','l','e','o','n','s',':','\n'};std::basic_string_view s1(a1.cbegin(), a1.cend());// deduction: CharT -> char static_assert(std::is_same_v<decltype(s1)::value_type,char>);std::cout<< s1; std::array a2{L'p', L'r', L'o', L't', L'o', L'n', L's', L'\n'};std::basic_string_view s2(a2.cbegin(), a2.cend());// deduction: CharT -> wchar_t static_assert(std::is_same_v<decltype(s2)::value_type,wchar_t>);std::wcout<< s2; std::array<long,9> a3{'n','e','u','t','r','o','n','s','\n'};std::basic_string_view s3(a3.cbegin(), a3.cend());// deduction: CharT -> long static_assert(std::is_same_v<decltype(s3)::value_type,long>);for(constauto e: s3)std::cout<<static_cast<char>(e);}
Output:
nucleons:protonsneutrons
