public static member constant
<string>
std::string::nposstatic const size_t npos = -1;
Maximum value for size_t
npos is a static member constant value with the greatest possible value for an element of type size_t.This value, when used as the value for a len (or sublen) parameter in string's member functions, means "until the end of the string".
As a return value, it is usually used to indicate no matches.
This constant is defined with a value of -1, which because size_t is an unsigned integral type, it is the largest possible representable value for this type.
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