std::basic_ios::clear
void clear( std::ios_base::iostate state = std::ios_base::goodbit ); | ? | ? |
|---|
的值来设置流错误状态标志。state默认情况下，分配STD：：IOS[医]基本：好位，具有清除所有错误状态标志的效果。
如果rdbuf() == 0然后state | badbit被分配了。可能会引发异常。
参数
state | - | new error state flags setting. It can be a combination of the following constants: Constant Explanation goodbit no error badbit irrecoverable stream error failbit input/output operation failed (formatting or extraction error) eofbit associated input sequence has reached end-of-file | Constant | Explanation | goodbit | no error | badbit | irrecoverable stream error | failbit | input/output operation failed (formatting or extraction error) | eofbit | associated input sequence has reached end-of-file |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
Constant | Explanation | |||||||||||
goodbit | no error | |||||||||||
badbit | irrecoverable stream error | |||||||||||
failbit | input/output operation failed (formatting or extraction error) | |||||||||||
eofbit | associated input sequence has reached end-of-file |
返回值
%280%29
例外
例
如果没有参数，则清除%28%29可用于在意外输入后取消设置故障位。
二次
#include <iostream>
#include <string>
int main()
{
double n;
while( std::cout << "Please, enter a number\n"
&& ! (std::cin >> n) )
{
std::cin.clear();
std::string line;
std::getline(std::cin, line);
std::cout << "I am sorry, but '" << line << "' is not a number\n";
}
std::cout << "Thank you for entering the number " << n << '\n';
}二次
另见
setstate | sets state flags (public member function) |
|---|---|
rdstate | returns state flags (public member function) |
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