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std::operator<<,>>

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< cpp‎ | string‎ | basic string

 
 
Strings Bibliothek
Null-terminierte Strings
Original:
Null-terminated strings
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Byte-Strings
Multibyte-Strings
Wide Strings
Classes
Original:
Classes
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basic_string
char_traits
 
std::basic_string
Member-Funktionen
Original:
Member functions
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basic_string::basic_string
basic_string::operator=
basic_string::assign
basic_string::get_allocator
Elementzugriff zerstört
Original:
Element access
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basic_string::at
basic_string::operator[]
basic_string::front(C++11)
basic_string::back(C++11)
basic_string::data
basic_string::c_str
Iteratoren
Original:
Iterators
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basic_string::begin
basic_string::cbegin

(C++11)
basic_string::end
basic_string::cend

(C++11)
basic_string::rbegin
basic_string::crbegin

(C++11)
basic_string::rend
basic_string::crend

(C++11)
Kapazität
Original:
Capacity
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basic_string::empty
basic_string::size
basic_string::length
basic_string::max_size
basic_string::reserve
basic_string::capacity
basic_string::shrink_to_fit(C++11)
Operations
Original:
Operations
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basic_string::clear
basic_string::insert
basic_string::erase
basic_string::push_back
basic_string::pop_back(C++11)
basic_string::append
basic_string::operator+=
basic_string::compare
basic_string::replace
basic_string::substr
basic_string::copy
basic_string::resize
basic_string::swap
Suchen
Original:
Search
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basic_string::find
basic_string::rfind
basic_string::find_first_of
basic_string::find_first_not_of
basic_string::find_last_of
basic_string::find_last_not_of
Konstanten
Original:
Constants
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basic_string::npos
Non-Member-Funktionen
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Non-member functions
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operator+
operator==
operator!=
operator<
operator>
operator<=
operator>=
swap(std::basic_string)
operator<<
operator>>
getline
stoi
stol
stoll
(C++11)
(C++11)
(C++11)
stoul
stoull
(C++11)
(C++11)
stof
stod
stold
(C++11)
(C++11)
(C++11)
to_string(C++11)
to_wstring(C++11)
Helper-Klassen
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Helper classes
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hash<std::string>
hash<std::wstring>
hash<std::u32string>
hash<std::u16string>
(C++11)
 
Defined in header <string>
template <class CharT, class Traits, class Allocator>

std::basic_ostream<CharT, Traits>&
    operator<<(std::basic_ostream<CharT, Traits>& os,

               const std::basic_string<CharT, Traits, Allocator>& str);
(1)
template <class CharT, class Traits, class Allocator>

std::basic_istream<CharT, Traits>&
    operator>>(std::basic_istream<CharT, Traits>& is,

               std::basic_string<CharT, Traits, Allocator>& str);
(2)
1)
Zunächst baut eine std::basic_ostream::sentry Objekt, welches spült die Krawatte () 'd Stream falls nötig und Fehler überprüft. Wenn die Wache Objekt zurückgibt false, sofort beendet .
Original:
First, constructs a std::basic_ostream::sentry object, which flushes the tie()'d stream if necessary and checks for errors. If the sentry object returns false, exits immediately.
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Danach, wenn der Posten Objekt zurückkehrt true, bestimmt das Ausgabeformat Polsterung in der gleichen Weise wie die Stufe 3 der num_put::put() .
Original:
Afterwards, if the sentry object returns true, determines the output format padding in the same manner as stage 3 of num_put::put().
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Dann speichert jedes Zeichen aus der resultierenden Sequenz (die Inhalte der str sowie padding) mit dem Ausgang Stream os, als ob durch den Aufruf os.rdbuf()->sputn(seq, n), wo n=std::max(os.width(), str.size())
Original:
Then stores each character from the resulting sequence (the contents of str plus padding) to the output stream os as if by calling os.rdbuf()->sputn(seq, n), where n=std::max(os.width(), str.size())
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Schließlich ruft os.width(0) .
Original:
Finally, calls os.width(0).
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2)
Zunächst baut eine std::basic_istream::sentry Objekt, welches spült die Krawatte () 'd Stream gegebenenfalls Extrakte und verwirft alle führenden Leerzeichen, wenn die ios_base::skipws Flagge wurde gelöscht, und prüft auf Fehler. Wenn die Wache Objekt zurückgibt false, sofort beendet .
Original:
First, constructs a std::basic_istream::sentry object, which flushes the tie()'d stream if necessary, extracts and discards all leading whitespace characters unless the ios_base::skipws flag was cleared, and checks for errors. If the sentry object returns false, exits immediately.
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Danach, wenn die Wache Objekt kehrt true, löscht str mit str.erase()
Original:
Afterwards, if the sentry object returns true, clears str with str.erase()
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Dann liest Zeichen aus is und fügt sie str wie durch str.append(1, c), bis eine der folgenden Bedingungen wahr wird:
Original:
Then reads characters from is and appends them to str as if by str.append(1, c), until one of the following conditions becomes true:
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  • N Zeichen gelesen werden, wo N is.width() ist, wenn is.width() > 0, sonst N ist str.max_size()
    Original:
    N characters are read, where N is is.width() if is.width() > 0, otherwise N is str.max_size()
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  • die End-of-File-Bedingung tritt im Strom is
    Original:
    the end-of-file condition occurs in the stream is
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  • std::isspace(c,is.getloc()) ist für das nächste Zeichen c in is (dies Leerzeichen bleibt in der Input-Stream) wahr .
    Original:
    std::isspace(c,is.getloc()) is true for the next character c in is (this whitespace character remains in the input stream).
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Wenn keine Zeichen werden dann extrahiert std::ios::failbit auf is, die std::ios_base::failure werfen kann eingestellt .
Original:
If no characters are extracted then std::ios::failbit is set on is, which may throw std::ios_base::failure.
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Schließlich ruft os.width(0) und zerstört die std::basic_istream::sentry Objekt .
Original:
Finally, calls os.width(0) and destroys the std::basic_istream::sentry object.
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Inhaltsverzeichnis

[Bearbeiten] Ausnahmen

1)
kann std::ios_base::failure werfen, wenn eine Ausnahme während der Ausgabe geworfen wird .
Original:
may throw std::ios_base::failure if an exception is thrown during output.
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2)
kann std::ios_base::failure werfen, wenn keine Zeichen aus is extrahiert werden (zB der Strom am Ende der Datei, oder aus Leerzeichen only), oder wenn eine Ausnahme während der Eingabe geworfen .
Original:
may throw std::ios_base::failure if no characters are extracted from is (e.g the stream is at end of file, or consists of whitespace only), or if an exception is thrown during input.
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[Bearbeiten] Parameter

os -
ein Zeichen Ausgabestream
Original:
a character output stream
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is -
ein Charakter Eingabestrom
Original:
a character input stream
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str -
die Zeichenkette eingefügt oder entnommen werden
Original:
the string to be inserted or extracted
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[Bearbeiten] Rückgabewert

1) os

2) is

[Bearbeiten] Beispiel

#include <iostream>
#include <string>
 
int main()
{
    std::string greeting = "Hello, whirled!"
    std::cout << greeting << '\n';
}

Output:

Hello, whirled!