std::basic_string::npos
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| static const size_type npos = -1; |
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Dies ist ein besonderer Wert gleich dem maximalen Wert darstellbar durch die Art
size_type. Die genaue Bedeutung abhängig vom Kontext, aber es wird in der Regel entweder als Ende der Zeichenkette Indikator durch die Funktionen, die eine Zeichenfolge-Index erwarten oder als Fehlerindikator durch die Funktionen, die eine Zeichenfolge-Index verbrauchten .Original:
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.The text has been machine-translated via Google Translate.
You can help to correct and verify the translation. Click here for instructions.
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[Bearbeiten] Beispiel
#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:
no 'a' in 'test' st 00011
