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    std::ranges::forward_range

    来自 zh.cppreference.net
     
    C++
     
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    范围适配器
     
    定义于头文件 <ranges> 
    template< class T >
concept forward_range =
    ranges::input_range<T> && std::forward_iterator<ranges::iterator_t<T>>;
    		(自C++20起)

    该forward_range概念是 range 的精化，对于该 range，ranges::begin 返回一个 forward_iterator 的模型。

    示例

    运行此代码 
    #include <forward_list>
#include <queue>
#include <ranges>
#include <span>
#include <stack>
#include <tuple>
const char* str{"not a forward range"};
const char str2[] = "a forward range";
static_assert(
    std::ranges::forward_range<decltype("a forward range")> &&
    !std::ranges::forward_range<decltype(str)> &&
    std::ranges::forward_range<decltype(str2)> &&
    !std::ranges::forward_range<std::stack<char>> &&
    std::ranges::forward_range<std::forward_list<char>> &&
    !std::ranges::forward_range<std::tuple<std::forward_list<char>>> &&
    std::ranges::forward_range<std::span<char>> &&
    !std::ranges::forward_range<std::queue<char>> &&
"");
int main() {}