std::left, std::right, std::internal

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< cpp | io | manip

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C++
 
輸入/輸出庫
I / O操縱
C-風格的I / O
緩衝區
Original:
Buffers
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basic_streambuf
basic_filebuf
basic_stringbuf
strstreambuf（過時了）
流
Original:
Streams
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抽象
Original:
Abstractions
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ios_base
basic_ios
basic_istream
basic_ostream
basic_iostream
文件I / O
Original:
File I/O
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basic_ifstream
basic_ofstream
basic_fstream
字元串I / O
Original:
String I/O
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basic_istringstream
basic_ostringstream
basic_stringstream
陣列的I / O
Original:
Array I/O
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istrstream（過時了）
ostrstream（過時了）
strstream（過時了）
類型
Original:
Types
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streamoff
streamsize
fpos
Error類的介面
Original:
Error category interface
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iostream_category（C++11）
io_errc（C++11）
 
輸入/輸出操縱
浮點格式
Original:
Floating-point formatting
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fixed
scientific
hexfloat
defaultfloat

（C++11）
（C++11）
整型格式
Original:
Integer formatting
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布爾格式
Original:
Boolean formatting
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boolalpha
noboolalpha
場的寬度和填充控制
Original:
Field width and fill control
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internal
left
right
其他格式
Original:
Other formatting
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空白處理
Original:
Whitespace processing
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輸出沖洗
Original:
Output flushing
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狀態標誌位操作
Original:
Status flags manipulation
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時間和金錢I / O
Original:
Time and money I/O
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get_money（C++11）
get_time（C++11）
put_money（C++11）
put_time（C++11）
 
Defined in header <ios>
(1)
(2)
std::ios_base& internal( std::ios_base& str );
 (3)
修改的填充字元的默認定位。 left和right適用於任何輸出，internal適用於整數，浮點，貨幣輸出。有沒有對輸入的影響.
Original:
Modifies the default positioning of the fill characters. left and right apply to any output, internal applies to integer, floating-point, and monetary output. Has no effect on input.
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1)
設置adjustfield的流strleft彷彿通過調用str.setf(std::ios_base::left, std::ios_base::adjustfield)
Original:
sets the adjustfield of the stream str to left as if by calling str.setf(std::ios_base::left, std::ios_base::adjustfield)
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2)
設置adjustfield的流strright彷彿通過調用str.setf(std::ios_base::right, std::ios_base::adjustfield)
Original:
sets the adjustfield of the stream str to right as if by calling str.setf(std::ios_base::right, std::ios_base::adjustfield)
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3)
設置adjustfield的流strinternal彷彿通過調用str.setf(std::ios_base::internal, std::ios_base::adjustfield)
Original:
sets the adjustfield of the stream str to internal as if by calling str.setf(std::ios_base::internal, std::ios_base::adjustfield)
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這是一個I / O操縱器，它可被稱為與表達式如out << std::left類型out任何std::basic_ostream，或與一個表達式如in >> std::left類型in任何std::basic_istream.
Original:
This is an I/O manipulator, it may be called with an expression such as out << std::left for any out of type std::basic_ostream or with an expression such as in >> std::left for any in of type std::basic_istream.
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目錄

[编辑] 參數

str -
參考I / O流
Original:
reference to I/O stream
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[编辑] 返回值

str（參考操作後到流）
Original:
str (reference to the stream after manipulation)
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[编辑] 為例

#include <iostream>
#include <iomanip>
#include <locale>
int main()
{
    std::cout.imbue(std::locale("en_US.utf8"));
    std::cout << "Left fill:\n" << std::left << std::setfill('*')
              << std::setw(12) << -1.23  << '\n'
              << std::setw(12) << std::hex << std::showbase << 42 << '\n'
              << std::setw(12) << std::put_money(123, true) << "\n\n";
 
    std::cout << "Internal fill:\n" << std::internal
              << std::setw(12) << -1.23  << '\n'
              << std::setw(12) << 42 << '\n'
              << std::setw(12) << std::put_money(123, true) << "\n\n";
 
    std::cout << "Right fill:\n" << std::right
              << std::setw(12) << -1.23  << '\n'
              << std::setw(12) << 42 << '\n'
              << std::setw(12) << std::put_money(123, true) << '\n';
}

Output: 

Left fill:
-1.23*******
0x2a********
USD *1.23***
 
Internal fill:
-*******1.23
0x********2a
USD ****1.23
 
Right fill:
*******-1.23
********0x2a
***USD *1.23

[编辑] 另請參閱
改變寬度的下一個輸入/輸出欄位
Original:
changes the width of the next input/output field
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（函數） [edit]
改變填充字元
Original:
changes the fill character
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（函數模板） [edit]
来自“http://zh.cppreference.com/mwiki/index.php?title=cpp/io/manip/left&oldid=27362”