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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 string indicator by the functions that expect a string index or as the error indicator by the functions that return a string index.
Example
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 | #include <iostream>#include <bitset>#include <string> int main(){ // string search functions return npos if nothing is found std::string s = "test"; if(s.find('a') == std::string::npos) std::cout << "no 'a' in 'test'\n"; // functions that take string subsets as arguments // use npos as the "all the way to the end" indicator std::string s2(s, 2, std::string::npos); std::cout << s2 << '\n'; std::bitset<5> b("aaabb", std::string::npos, 'a', 'b'); std::cout << b << '\n';} |
Output:
1 2 3 | no 'a' in 'test'st00011 |
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