operator<<<div class="t-tr-text">（性病:: basic_ostream）<div class="t-tr-dropdown"><div><div><div class="t-tr-dropdown-arrow-border"></div><div class="t-tr-dropdown-arrow"></div><div class="t-tr-dropdown-h">Original:</div><div class="t-tr-dropdown-orig">(std::basic_ostream)</div><div class="t-tr-dropdown-notes">The text has been machine-translated via [http://translate.google.com Google Translate].<br/> You can help to correct and verify the translation. Click [http://en.cppreference.com/w/Cppreference:MachineTranslations here] for instructions.</div></div></div></div></div>

来自cppreference.com

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C++
 
输入/输出库
I / O操纵
C-风格的I / O
缓冲区
Original:
Buffers
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basic_streambuf
basic_filebuf
basic_stringbuf
strstreambuf（过时了）
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
字符串I / O
Original:
String I/O
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basic_istringstream
basic_ostringstream
basic_stringstream
阵列的I / O
Original:
Array I/O
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istrstream（过时了）
ostrstream（过时了）
strstream（过时了）
类型
Original:
Types
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streamoff
streamsize
fpos
Error类的接口
Original:
Error category interface
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iostream_category（C++11）
io_errc（C++11）
 
std::basic_ostream
全局对象
Original:
Global objects
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成员函数
Original:
Member functions
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basic_ostream::basic_ostream
basic_ostream::~basic_ostream
basic_ostream::operator=（C++11）
格式化的输入
Original:
Formatted input
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basic_ostream::operator<<
未格式化的输入
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Unformatted input
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basic_ostream::put
basic_ostream::write
定位
Original:
Positioning
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basic_ostream::tellp
basic_ostream::seekp
杂项
Original:
Miscellaneous
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basic_ostream::flush
basic_ostream::swap（C++11）
会员类别
Original:
Member classes
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basic_ostream::sentry
非成员函数
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Non-member functions
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operator<<(std::basic_ostream)
 
template< class CharT, class Traits>

basic_ostream<CharT,Traits>& operator<<( basic_ostream<CharT,Traits>& os,
                                         CharT ch );
template< class CharT, class Traits>
basic_ostream<CharT,Traits>& operator<<( basic_ostream<CharT,Traits>& os,
                                         char ch );
template< class Traits >
basic_ostream<char,Traits>& operator<<( basic_ostream<char,Traits>& os,
                                        char ch );
template< class Traits >
basic_ostream<char,Traits>& operator<<( basic_ostream<char,Traits>& os,
                                        signed char ch );
template< class Traits >
basic_ostream<char,Traits>& operator<<( basic_ostream<char,Traits>& os,

                                        unsigned char ch );
 (1)
template< class CharT, class Traits >

basic_ostream<CharT,Traits>& operator<<( basic_ostream<CharT,Traits>& os,
                                         const CharT* s );
template< class CharT, class Traits >
basic_ostream<CharT,Traits>& operator<<( basic_ostream<CharT,Traits>& os,
                                         const char* s );
template< class Traits >
basic_ostream<char,Traits>& operator<<( basic_ostream<char,Traits>& os,  
                                        const char* s );
template< class Traits >
basic_ostream<char,Traits>& operator<<( basic_ostream<char,Traits>& os,
                                        const signed char* s );
template< class Traits >
basic_ostream<char,Traits>& operator<<( basic_ostream<char,traits>& os,

                                        const unsigned char* s );
 (2)
template< class CharT, class Traits, class T >

basic_ostream< charT, traits >& operator<<( basic_ostream<CharT,Traits>&& os,

                                            const T& value );
 (3) （C++11 起）
插入一个字符或字符串.
Original:
Inserts a character or a character string.
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1-2)
的格式输出功能：开始执行构造一个对象的类型sentry，刷新tie()'d的输出缓冲区，如果必要的检查流错误。项目建成后，如果哨兵对象返回false，这些函数返回没有尝试任何输出。如果发生错误，在输出过程中，这些函数调用setstate(ios_base::failbit)。如果抛出一个异常，然后在输出的ios :: badbit（exceptions()&badbit) != 0被抑制，除非，在这种情况下，它被重新抛出异常）
Original:
are formatted output functions: they begin execution by constructing an object of type sentry, which flushes the tie()'d output buffers if necessary and checks the stream errors. After construction, if the sentry object returns false, these functions return without attempting any output. If an error occurs during output, these functions call setstate(ios_base::failbit). If an exception is thrown during output, then ios::badbit is set (the exception is suppressed unless exceptions()&badbit) != 0, in which case it is rethrown)
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1)
插入字符ch。如果字符的类型是不CharT，它首先被转化os.widen(ch)。如果第3阶段num_put::put()填充确定。在插入之后，被称为width(0).
Original:
Inserts a character ch. If the type of the character is not CharT, it is first converted with os.widen(ch). Padding is determined as if by Stage 3 of num_put::put(). After insertion, width(0) is called.
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2)
将连续的字符的字符数组，该数组的第一个元素是指向s.
Original:
Inserts successive characters from the character array whose first element is pointed to by s.
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  • 为第一和第三的重载（CharT相匹配的类型的ch），完全相同traits::length(s)字符被插入.
    Original:
    for the first and third overloads (where CharT matches the type of ch), exactly traits::length(s) characters are inserted.
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  • 第二个重载，完全std::char_traits<char>::length(s)字符插入.
    Original:
    for the second overload, exactly std::char_traits<char>::length(s) characters are inserted.
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  • 在过去的两个多载，正是traits::length(reinterpret_cast<const char*>(s))插入.
    Original:
    for the last two overloads, exactly traits::length(reinterpret_cast<const char*>(s)) are inserted.
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如果第3阶段num_put::put()填充确定。扩大使用os.widen()在插入之前的所有字符。在插入之后，被称为width(0).
Original:
Padding is determined as if by Stage 3 of num_put::put(). All characters are widened using os.widen() before insertion. After insertion, width(0) is called.
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3)
调用适当的插入运算符，一个右值引用到输出流对象（相当于os << value）.
Original:
Calls the appropriate insertion operator, given an rvalue reference to an output stream object (equivalent to os << value).
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目录

[编辑] 参数

os -
输出流中插入数据
Original:
output stream to insert data to
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ch -
参考字符插入
Original:
reference to a character to insert
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s -
插入一个字符串的指针
Original:
pointer to a character string to insert
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[编辑] 返回值

st

[编辑] 为例

#include <iostream>
#include <sstream>
int main()
{
    std::cout << "Hello, world" // the const char* overlaod
              << '\n';          // the char overload
    std::string s = (std::ostringstream() << 1.2).str(); // rvalue overload
    std::cout << s << '\n';
}

Output: 

Hello, world
1.2

[编辑] 另请参阅
插入格式化的数据
Original:
inserts formatted data
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（公共成员函数） [edit]
来自“http://zh.cppreference.com/mwiki/index.php?title=cpp/io/basic_ostream/operator_ltlt2&oldid=28396”