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deduction guides for std::ranges::lazy_split_view

From cppreference.net
C++
Ranges library
Range adaptors
std::ranges::lazy_split_view
template < class R, class P >

lazy_split_view ( R && , P && )

- > lazy_split_view < views:: all_t < R > , views:: all_t < P >> ;
(1) (C++20 起)
template < ranges:: input_range R >

lazy_split_view ( R && , ranges:: range_value_t < R > )
- > lazy_split_view < views:: all_t < R > ,

ranges:: single_view < ranges:: range_value_t < R >>> ;
(2) (C++20 起)

这些 推导指引 为 lazy_split_view 提供，允许从范围对象和分隔符进行推导。

1) 分隔符是一个元素范围。
2) 分隔符是单个元素。

示例

运行此代码 
#include <ranges>
#include <string_view>
#include <type_traits>
using std::operator""sv;
int main()
{
    std::ranges::lazy_split_view w1{"a::b::c"sv, "::"sv};
    // w1 的类型是 lazy_split_view<string_view, string_view>:
    static_assert(std::is_same_v<
        decltype(w1),
        std::ranges::lazy_split_view<
            std::basic_string_view<char, std::char_traits<char>>,
            std::basic_string_view<char, std::char_traits<char>>>>);
    std::ranges::lazy_split_view w2{"x,y,z"sv, ','};
    // w2 的类型是 lazy_split_view<string_view, single_view<char>>:
    static_assert(std::is_same_v<
        decltype(w2),
        std::ranges::lazy_split_view<
            std::basic_string_view<char, std::char_traits<char>>,
            std::ranges::single_view<char>>>);
}