C++ 什么叫“运算符<<”？
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What is "operator<<" called?
提问by ScaryAardvark
I know the names of most of the operators but not sure what operator<<and operator>>are called.
我所知道的大多数运营商的名字，但不知道什么operator<<和operator>>被调用。
i.e.
IE
operator=() // the assignment operator
operator==() // the equality of comparison operator
operator++() // the increment operator
operator--() // decrement operator etc.
operator<() // the less-than operator
and so forth...
等等……
采纳答案by Mitch Wheat
<<left shift
<<左移
>>right shift
>>右移
回答by Scott Stafford
<<is both the insertion operator and the left-shift operator.>>is the extraction operator and the right-shift operator.
<<既是插入运算符又是左移运算符。>>是提取运算符和右移运算符。
In the context of iostreams, they are considered to be stream insertion/extraction. In the context of bit-shifting, they are left-shift and right-shift.
在 iostream 的上下文中，它们被认为是流插入/提取。在位移的上下文中，它们是左移和右移。
回答by cpx
In C++ Streams,
在 C++ 流中，
<<is insertion operator.>>is extraction operator.
<<是插入运算符。>>是提取运算符。
In Binary Operations,
在二元运算中，
- Right shift (>>)
- Left shift (<<)
- 右移 (>>)
- 左移 (<<)
回答by GaryDevenay
<< = Bitwise left shift
>> = Bitwise right shift
回答by davbryn
回答by Jon Purdy
The original names were left shiftoperator (<<) and right shiftoperator (>>), but with their meanings perverted by streams into insertion and extraction, you could argue that even in bitwise operations <<insertsbits on the right while >>extractsthem. Consequently, I almost always refer to them as the insertionand extractionoperators.
最初的名称是左移运算符 ( <<) 和右移运算符 ( >>)，但由于它们的含义被流扭曲为插入和提取，您可能会争辩说，即使在按位运算中，在提取它们时也会在右侧<<插入位。因此，我几乎总是将它们称为插入和提取运算符。>>
回答by Fraser
<< is the 'left-shift' operator. It shifts its first operand left by the number of bits specified by its second operand.
<< 是“左移”运算符。它将第一个操作数左移第二个操作数指定的位数。
回答by Robben_Ford_Fan_boy
They are called the Guillemet Left and Guillemet Right symbols :)
它们被称为 Guillemet Left 和 Guillemet Right 符号:)
