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std::basic_istream::tellg

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< cpp‎ | io‎ | basic istream

 
 
入力/出力ライブラリ
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CスタイルのI / O
バッファ
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Buffers
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basic_streambuf
basic_filebuf
basic_stringbuf
strstreambuf(廃止予定)
ストリーム
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Streams
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抽象化
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Abstractions
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ios_base
basic_ios
basic_istream
basic_ostream
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File I/O
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basic_ifstream
basic_ofstream
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文字列I / O
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String I/O
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basic_istringstream
basic_ostringstream
basic_stringstream
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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
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streamoff
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fpos
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Error category interface
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iostream_category(C++11)
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std::basic_istream
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Global objects
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cin
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メンバ関数
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Member functions
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basic_istream::basic_istream
basic_istream::~basic_istream
basic_istream::operator=(C++11)
書式付き入力
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Formatted input
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basic_istream::operator>>
書式なし入力
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Unformatted input
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basic_istream::get
basic_istream::peek
basic_istream::unget
basic_istream::putback
basic_istream::getline
basic_istream::ignore
basic_istream::read
basic_istream::readsome
basic_istream::gcount
ポジショニング
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Positioning
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basic_istream::tellg
basic_istream::seekg
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Miscellaneous
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basic_istream::sync
basic_istream::swap(C++11)
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basic_istream::sentry
非メンバ関数
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operator>>(std::basic_istream)
 
pos_type tellg();

Returns input position indicator of the current associated streambuf object.

Behaves as UnformattedInputFunction. After constructing and checking the sentry object, if fail()==true, returns pos_type(-1). Otherwise, returns rdbuf()->pubseekoff(0, std::ios_base::cur, std::ios_base::in).

目次

[編集] パラメータ

(なし)
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(none)
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[編集] 値を返します

current position of the get pointer on success, pos_type(-1) on failure

[編集]

#include <iostream>
#include <string>
#include <sstream>
int main()
{
    std::string str = "Hello, world";
    std::istringstream in(str);
    std::string word;
    in >> word;
    std::cout << "After reading the word \"" << word
              << "\" tellg() returns " << in.tellg() << '\n';
}

Output:

After reading the word "Hello," tellg() returns 6

[編集] も参照してください

sets the input position indicator
(パブリックメンバ関数) [edit]
出力位置標識を戻します
Original:
returns the output position indicator
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(パブリックメンバ関数of std::basic_ostream) [edit]
出力位置インジケータを設定します
Original:
sets the output position indicator
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(パブリックメンバ関数of std::basic_ostream) [edit]