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std::basic_string_view::npos

性病：基本[医]弦[医]意见：本国专业干事

static constexpr size_type npos = size_type(-1​(since C++17)

这是一个特殊值，它等于可由类型表示的最大值。size_type准确的含义取决于上下文，但通常由预期视图索引的函数用作视图结束指示符，或者由返回视图索引的函数用作错误指示符。

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