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std::basic_fstream::basic_fstream – cppreference.com

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basic_fstream();

(1)

basic_fstream( const char* filename, {{#pad:|13}} ios_base::openmode mode = ios_base::in|ios_base::out );

(2)

basic_fstream( const string& filename, {{#pad:|13}} ios_base::openmode mode = ios_base::in|ios_base::out );

(3) (seit C++11)

basic_fstream( basic_fstream&& other );

(4) (seit C++11)

basic_fstream( const basic_fstream& rhs) = delete;

(5)

Erzeugt neue Datei-Stream .

Original:

Constructs new file stream.

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1)

Standard constructor: baut einen Stream, der nicht mit einer Datei zugeordnet ist: default-konstruiert die std::basic_filebuf und baut die Basis mit dem Zeiger auf diese default-konstruiert std::basic_filebuf Mitglied .

Original:

Default constructor: constructs a stream that is not associated with a file: default-constructs the std::basic_filebuf and constructs the base with the pointer to this default-constructed std::basic_filebuf member.

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2)

Zuerst führt die gleichen Schritte wie die Default-Konstruktor, dann asssociate den Strom mit einer Datei durch den Aufruf rdbuf()->open(filename, mode).. Wenn die open ()-Aufruf gibt einen Null-Zeiger, setzt setstate(failbit) .

Original:

First, performs the same steps as the default constructor, then asssociate the stream with a file by calling rdbuf()->open(filename, mode).. If the open() call returns a null pointer, sets setstate(failbit).

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3)

Gleich wie basic_fstream(filename.c_str(), mode) .

Original:

Same as basic_fstream(filename.c_str(), mode).

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4)

Bewegen Konstruktor. Zunächst Bewegung baut die Basisklasse von other (was keinen Einfluss auf die rdbuf() Zeiger), dann bewegen-baut das std::basic_filebuf Mitglied, dann nennt this->set_rdbuf() die neue basic_filebuf als rdbuf() Zeiger in der Basisklasse installieren .

Original:

Move constructor. First, move-constructs the base class from other (which does not affect the rdbuf() pointer), then move-constructs the std::basic_filebuf member, then calls this->set_rdbuf() to install the new basic_filebuf as the rdbuf() pointer in the base class.

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5)

Der Copy-Konstruktor wird gelöscht: Diese Klasse ist nicht kopierbar .

Original:

The copy-constructor is deleted: this class is not copyable.

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Parameter

filename -

der Name der Datei, die geöffnet werden kann

Original:

the name of the file to be opened

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mode -

legt Stream offenen Modus. Es ist Bitmaske Typ sind die folgenden Konstanten definiert:

Constant

Original:

Constant

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Explanation
app

versuchen Ende Strom vor jedem Schreibvorgang

Original:

seek to the end of stream before each write

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binary

Öffnen Sie im Binär-Modus

Original:

open in binary mode

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in

zum Lesen öffnen

Original:

open for reading

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out

zum Schreiben geöffnet

Original:

open for writing

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trunc

Verwerfen der Inhalt des Stroms beim Öffnen

Original:

discard the contents of the stream when opening

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ate

versuchen Ende Stromes unmittelbar nach geöffnet

Original:

seek to the end of stream immediately after open

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Original:

specifies stream open mode. It is bitmask type, the following constants are defined:

Constant

Original:

Constant

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Explanation
app

versuchen Ende Strom vor jedem Schreibvorgang

Original:

seek to the end of stream before each write

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binary

Öffnen Sie im Binär-Modus

Original:

open in binary mode

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in

zum Lesen öffnen

Original:

open for reading

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out

zum Schreiben geöffnet

Original:

open for writing

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trunc

Verwerfen der Inhalt des Stroms beim Öffnen

Original:

discard the contents of the stream when opening

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ate

versuchen Ende Stromes unmittelbar nach geöffnet

Original:

seek to the end of stream immediately after open

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other -

andere Datei-Stream, der als Quelle verwenden

Original:

another file stream to use as source

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Beispiel

#include <fstream>
#include <utility>
#include <string>
int main()
{
std::fstream f0;
    std::fstream f1("test.bin", std::ios::binary);
    std::string name = "example.txt";
    std::fstream f2(name);
    std::fstream f3(std::move(f1));
}

Siehe auch

öffnet eine Datei und ordnet sie mit dem Strom

Original:

opens a file and associates it with the stream

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(öffentliche Elementfunktion) [edit]

öffnet eine Datei und konfiguriert es wie die zugehörige Zeichenfolge

Original:

opens a file and configures it as the associated character sequence

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(öffentliche Elementfunktion of std::basic_filebuf) [edit]

ersetzt die rdbuf ohne Löschen seinen Fehler Zustand

Original:

replaces the rdbuf without clearing its error state

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(geschützt Member-Funktion) [edit]

Baut das Objekt

Original:

constructs the object

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(öffentliche Elementfunktion of std::basic_iostream) [edit]