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std::basic_istream::peek

性病：基本[医]iStream：：peek

int_type peek(​​

表现为UnformattedInputFunction.在构造和测试哨兵对象之后，从输入流中读取下一个字符，而不提取它。

参数

%280%29

返回值

如果good() == true，返回由rdbuf()->sgetc()...

否则，返回Traits::eof()...

例外

failure如果发生错误%28，则错误状态标志不是goodbit29%和exceptions()将被抛向那个州。

如果内部操作抛出异常，则会捕获该操作，并且badbit已经设定好了。如果exceptions()设置为badbit，异常将被重新抛出。

例

二次

#include <sstream>
#include <iostream>
int main()
{
    std::istringstream s1("Hello, world."
    char c1 = s1.peek(
    char c2 = s1.get(
    std::cout << "Peeked: " << c1 << " got: " << c2 << '\n';
}

二次

产出：

二次

Peeked: H got: H

二次

另见

sgetcreads one character from the input sequence without advancing the sequence (public member function of std::basic_streambuf)
getextracts characters (public member function)
ungetunextracts a character (public member function)

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