std::basic_string_view::npos - cppreference.com

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# std::basic_string_view::npos

From cppreference.com
< cpp‎ | string‎ | basic string view

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

This is a special value equal to the maximum value representable by the type `size_type`. The exact meaning depends on context, but it is generally used either as end of view indicator by the functions that expect a view index or as the error indicator by the functions that return a view index.

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