std::basic_filebuf::showmanyc

 

C++

言語

コンセプト

ユーティリティライブラリ

ストリングスライブラリ

コンテナライブラリ

アルゴリズムライブラリ

イテレータライブラリ

ニューメリックスライブラリ

入力/出力ライブラリ

ローカライゼーションライブラリ

正規表現ライブラリ (C++11)

アトミック操作ライブラリ (C++11)

スレッドのサポートライブラリ (C++11)

 

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 The text has been machine-translated via Google Translate. You can help to correct and verify the translation. Click here for instructions.

basic_streambuf

basic_filebuf

basic_stringbuf

strstreambuf (廃止予定)

ストリーム Original: Streams The text has been machine-translated via Google Translate. You can help to correct and verify the translation. Click here for instructions.

抽象化 Original: Abstractions The text has been machine-translated via Google Translate. You can help to correct and verify the translation. Click here for instructions.

ios_base

basic_ios

basic_istream

basic_ostream

basic_iostream

ファイルI / O Original: File I/O The text has been machine-translated via Google Translate. You can help to correct and verify the translation. Click here for instructions.

basic_ifstream

basic_ofstream

basic_fstream

文字列I / O Original: String I/O The text has been machine-translated via Google Translate. You can help to correct and verify the translation. Click here for instructions.

basic_istringstream

basic_ostringstream

basic_stringstream

アレイのI / O Original: Array I/O The text has been machine-translated via Google Translate. You can help to correct and verify the translation. Click here for instructions.

istrstream (廃止予定)

ostrstream (廃止予定)

strstream (廃止予定)

タイプ Original: Types The text has been machine-translated via Google Translate. You can help to correct and verify the translation. Click here for instructions.

streamoff

streamsize

fpos

エラーカテゴリインターフェース Original: Error category interface The text has been machine-translated via Google Translate. You can help to correct and verify the translation. Click here for instructions.

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 The text has been machine-translated via Google Translate. You can help to correct and verify the translation. Click here for instructions.

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 The text has been machine-translated via Google Translate. You can help to correct and verify the translation. Click here for instructions.

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 The text has been machine-translated via Google Translate. You can help to correct and verify the translation. Click here for instructions.

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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パラメータ

（なし）

Original:

(none)

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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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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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例

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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このコードを実行します

#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';
}

出力:

showmanyc() returns 6626

も参照してください

in_avail	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 The text has been machine-translated via Google Translate. You can help to correct and verify the translation. Click here for instructions. (パブリックメンバ関数of std::basic_streambuf)
readsome	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 The text has been machine-translated via Google Translate. You can help to correct and verify the translation. Click here for instructions. (パブリックメンバ関数of std::basic_istream)