std::string::npos
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保存，以便以后查看！static const size_t npos = -1;
Maximum value（最大值） for size_t
npos is a static member constant value with the greatest possible value for an element of typesize_t.This value, when used as the value for a count parameter n in string's member functions, roughly indicates"as many as possible".
When used in some pos parameters that allow for out-of-range values, npos indicates the end of the string.
As a return value it is usually used to indicate failure.
This constant is actually defined with a value of -1 (for any trait), which becausesize_t is an unsigned integral type, becomes the largest possible representable value for this type.
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