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std::basic_filebuf::showmanyc

提供: cppreference.com
< cpp‎ | io‎ | basic filebuf

 
 
入力/出力ライブラリ
I / Oのマニピュレータ
CスタイルのI / O
バッファ
Original:
Buffers
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basic_streambuf
basic_filebuf
basic_stringbuf
strstreambuf(廃止予定)
ストリーム
Original:
Streams
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抽象化
Original:
Abstractions
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ios_base
basic_ios
basic_istream
basic_ostream
basic_iostream
ファイルI / O
Original:
File I/O
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basic_ifstream
basic_ofstream
basic_fstream
文字列I / O
Original:
String I/O
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basic_istringstream
basic_ostringstream
basic_stringstream
アレイのI / O
Original:
Array I/O
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istrstream(廃止予定)
ostrstream(廃止予定)
strstream(廃止予定)
タイプ
Original:
Types
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streamoff
streamsize
fpos
エラーカテゴリインターフェース
Original:
Error category interface
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iostream_category(C++11)
io_errc(C++11)
 
std::basic_filebuf
パブリックメンバ関数
Original:
Public member functions
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basic_filebuf::basic_filebuf
basic_filebuf::~basic_filebuf
basic_filebuf::operator=(C++11)
basic_filebuf::swap(C++11)
basic_filebuf::is_open
basic_filebuf::open
basic_filebuf::close
メンバ関数を保護しました
Original:
Protected member functions
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basic_filebuf::showmanyc
basic_filebuf::underflow
basic_filebuf::uflow
basic_filebuf::pbackfail
basic_filebuf::overflow
basic_filebuf::setbuf
basic_filebuf::seekoff
basic_filebuf::seekpos
basic_filebuf::sync
basic_filebuf::imbue
非メンバ関数
Original:
Non-member functions
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swap(std::basic_filebuf)(C++11)
 
protected:
virtual std::streamsize showmanyc()
実装されていれば、ファイルからの読み込みに残された文字の数を返します。.
Original:
If implemented, returns the number of characters left to read from the file.
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目次

[編集] パラメータ

(なし)
Original:
(none)
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[編集] 値を返します

ファイルの終わりに達した場合はファイル、または-1からの読込みに使用可能な文字数.
Original:
The number of characters available for reading from the file, or -1 if the end of file was reached.
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[編集] ノート

この機能はオプションです。実装されていない場合、この関数は0を返します(基本クラスバ​​ージョンstd::basic_streambuf::showmanycが呼び出されるので)
Original:
This function is optional. If not implemented, this function returns 0 (since the base class version std::basic_streambuf::showmanyc gets called)
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get領域が空かどう実装するかどうかにかかわらず、この関数は通常std::basic_streambuf::in_availによって呼び出されます.
Original:
Whether implemented or not, this function is normally called by std::basic_streambuf::in_avail if the get area is empty.
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[編集]

showmanyc()はfilebufにのために実装されているかどうかを確認するために、実装·テスト
Original:
implementation test to see if showmanyc() is implemented for filebuf
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#include <fstream>
#include <iostream>
 
struct mybuf : std::filebuf
{
     using std::filebuf::showmanyc;
};
 
int main()
{
    mybuf fin;
    fin.open("test.in", std::ios_base::in);
    std::cout << "showmanyc() returns " << fin.showmanyc() << '\n';
}

Output:

showmanyc() returns 6626

[編集] も参照してください

get領域で直ちに利用可能な文字数を取得します
Original:
obtains the number of characters immediately available in the get area
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(パブリックメンバ関数of std::basic_streambuf) [edit]
文字の既に利用可能なブロックを抽出します
Original:
extracts already available blocks of characters
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(パブリックメンバ関数of std::basic_istream) [edit]