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std::basic_ios::bad

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< cpp | io | basic ios

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输入/输出库

C-风格的I / O

缓冲区

basic_streambuf

basic_stringbuf

（过时了）

流

抽象

文件I / O

字符串I / O

basic_istringstream

basic_ostringstream

basic_stringstream

阵列的I / O

（过时了）

（过时了）

（过时了）

类型

Error类的接口

iostream_category

（C++11）

（C++11）

std::basic_ios

成员函数

basic_ios::basic_ios

basic_ios::~basic_ios

国家职能

basic_ios::good

basic_ios::fail

basic_ios::bad

basic_ios::operator!

basic_ios::operator bool

basic_ios::rdstate

basic_ios::setstate

basic_ios::clear

格式化

basic_ios::copyfmt

basic_ios::fill

杂项

basic_ios::exceptions

basic_ios::imbue

basic_ios::rdbuf

basic_ios::narrow

basic_ios::widen

受保护的成员函数

basic_ios::init

basic_ios::move

basic_ios::swap

basic_ios::set_rdbuf


bool bad() const;

返回true不可恢复的错误发生在相关的数据流。具体而言，回报true如果badbit在rdstate().

badbit在下列情况下，标准库设置

插入到输出流中的put（）或write（）因任何原因而失败.....
Original:
Insertion into the output stream by put() or write() fails for any reason.
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插入到输出流中操作符operator <<，std::put_money或std::put_time，无法完成，因为年底达到的输出流（如num_put::put()方面的格式输出功能或money_put::put()，返回一个迭代器iter，iter.failed()==true）
Original:
Insertion into the output stream by 操作符operator <<, std::put_money or std::put_time, could not complete because the end of the output stream was reached (The facet's formatting output function such as num_put::put() or money_put::put(), returns an iterator iter such that iter.failed()==true)
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流构造一个空指针rdbuf（），，或补篮（）/ unget（）被称为一个空rdbuf（），或一个空指针传递给运营商“（basic_streambuf *）流
Original:
Stream is constructed with a null pointer for rdbuf(), or putback()/unget() is called on a stream with a null rdbuf(), or a null pointer passed to operator<<(basic_streambuf*)
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rdbuf（） - > sputbackc（）或rdbuf（） - > sungetc（）返回性状:: EOF（）补篮（）或unget（）
Original:
rdbuf()->sputbackc() or rdbuf()->sungetc() return traits::eof() to putback() or unget()
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rdbuf（） - > pubsync（，）返回-1同步（），flush（）函数或析构函数的ostream ::哨兵一unitbuf流
Original:
rdbuf()->pubsync() returns -1 to sync(), to flush(), or to the destructor of ostream::sentry on a unitbuf stream
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抛出异常的I / O操作过程中的任何成员函数相关的数据流缓冲（例如sbumpc xsputn（），（），，sgetc（），溢出（），等）
Original:
Exception is thrown during an I/O operation by any member function of the associated stream buffer (e.g. sbumpc(), xsputn(), sgetc(), overflow(), etc)
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异常被抛出iword（）或PWORD（）（如std :: bad_alloc的）
Original:
Exception is thrown in iword() or pword() (e.g. std::bad_alloc)
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目录

1 参数
2 返回值
3 为例
4 另请参阅

[编辑] 参数

（无）

[编辑] 返回值

true如果发生不可恢复的错误，false否则.

[编辑] 为例

#include <iostream>
#include <fstream>
#include <cstdlib>
int main()
{
    std::ifstream file("test.txt");
    if(!file)  // operator! is used here
    {  
        std::cout << "File opening failed\n";
        return EXIT_FAILURE;
    }
 
    // typical C++ I/O loop uses the return value of the I/O function
    // as the loop controlling condition, operator bool() is used here
    for(int n; file >> n; ) {
       std::cout << n << ' ';
    }
    std::cout << '\n';
 
    if (file.bad())
        std::cout << "I/O error while reading\n";
    else if (file.eof())
        std::cout << "End of file reached successfully\n";
    else if (file.fail())
        std::cout << "Non-integer data encountered\n";
}

[编辑] 另请参阅

`ios_base::iostate` flags			basic_ios accessors
eofbit	failbit	badbit	`good()`	`fail()`	`bad()`	`eof()`	`operator bool()`	`operator!()`
false	false	false	true	false	false	false	true	false
false	false	true	false	true	true	false	false	true
false	true	false	false	true	false	false	false	true
false	true	true	false	true	true	false	false	true
true	false	false	false	false	false	true	true	false
true	false	true	false	true	true	true	false	true
true	true	false	false	true	false	true	false	true
true	true	true	false	true	true	true	false	true

来自“http://zh.cppreference.com/mwiki/index.php?title=cpp/io/basic_ios/bad&oldid=28796”