Inserts len bytes of val into string at pos.

If len is positive, val may contain embedded nuls and need not be nul-terminated. It is the caller's responsibility to ensure that val has at least len addressable bytes.

If len is negative, val must be nul-terminated and len is considered to request the entire string length.

If pos is -1, bytes are inserted at the end of the string.

class StringG
ptrdiff_t pos
string val
ptrdiff_t len


pos ptrdiff_t

position in string where insertion should happen, or -1 for at the end

val string

bytes to insert

len ptrdiff_t

number of bytes of val to insert, or -1 for all of val

Return Value

Type: StringG