std::basic_string_view<CharT,Traits>::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.