std::basic_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
sgetc | reads one character from the input sequence without advancing the sequence (public member function of std::basic_streambuf) |
|---|---|
get | extracts characters (public member function) |
unget | unextracts a character (public member function) |
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