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鍍金池/ 教程/ C++/ ios非運算符

std::put_money()函數(shù)

1. std::put_money()函數(shù)

std::setprecision()函數(shù)

1. std::setprecision()函數(shù)

std::get_time()函數(shù)

1. std::get_time()函數(shù)

basic_ios::openmode

1. basic_ios::openmode

basic_ios::basic_ios構(gòu)造函數(shù)

1. basic_ios::basic_ios構(gòu)造函數(shù)

ios::rdstate()函數(shù)

1. ios::rdstate()函數(shù)

ios::good()函數(shù)

1. ios::good()函數(shù)

C++ <fstream>

1. C++ <fstream>

fstream::swap()函數(shù)

1. fstream::swap()函數(shù)

ios非運算符

1. ios非運算符

ostream運算符=

1. ostream運算符=

std::resetiosflags()函數(shù)

1. std::resetiosflags()函數(shù)

ios::move()函數(shù)

1. ios::move()函數(shù)

ios::clear()函數(shù)

1. ios::clear()函數(shù)

std::fpos()函數(shù)

1. std::fpos()函數(shù)

ios::narrow()函數(shù)

1. ios::narrow()函數(shù)

fstream::close()函數(shù)

1. fstream::close()函數(shù)

ios::imbue()函數(shù)

1. ios::imbue()函數(shù)

basic_ios::setstate

1. basic_ios::setstate

ios_base::fmtflags

1. ios_base::fmtflags

C++ <iomanip>

1. C++ <iomanip>

std::setw()函數(shù)

1. std::setw()函數(shù)

ios_base::failure

1. ios_base::failure

C++ <basic_ios>

1. C++ <basic_ios>

ios::fill()函數(shù)

1. ios::fill()函數(shù)

ios_base::Init

1. ios_base::Init

ios::widen()函數(shù)

1. ios::widen()函數(shù)

ios庫<ios>

1. ios庫<ios>

std::setbases()函數(shù)

1. std::setbases()函數(shù)

ios::swap()函數(shù)

1. ios::swap()函數(shù)

ios::set_rdbuf()函數(shù)

1. ios::set_rdbuf()函數(shù)

std::setiosflags()函數(shù)

1. std::setiosflags()函數(shù)

std::put_time()函數(shù)

1. std::put_time()函數(shù)

std::get_money()函數(shù)

1. std::get_money()函數(shù)

ios_base::seekdir

1. ios_base::seekdir

ios_base::event_callback()函數(shù)

1. ios_base::event_callback()函數(shù)

fstream::rdbuf()函數(shù)

1. fstream::rdbuf()函數(shù)

std::setfill()函數(shù)

1. std::setfill()函數(shù)

fstream::isopen()函數(shù)

1. fstream::isopen()函數(shù)

ios::tie()函數(shù)

1. ios::tie()函數(shù)

ios::copyfmt()函數(shù)

1. ios::copyfmt()函數(shù)

fstream::open()函數(shù)

1. fstream::open()函數(shù)

basic_ios::basic_ios析構(gòu)函數(shù)

1. basic_ios::basic_ios析構(gòu)函數(shù)

ios_event::eof()函數(shù)

1. ios_event::eof()函數(shù)

io::rdbuf()函數(shù)

1. io::rdbuf()函數(shù)

ios::exceptions()函數(shù)

1. ios::exceptions()函數(shù)

ios::init()函數(shù)

1. ios::init()函數(shù)

ios_base::event()函數(shù)

1. ios_base::event()函數(shù)

C++標準庫教程

1. C++標準庫教程

ios非運算符

它用于檢查評估流（非）。這相當(dāng)于調(diào)用成員失敗。

聲明

下面是ios::operator！函數(shù)的聲明。

bool operator!() const;

返回值

如果設(shè)置了failbit或badbit 則返回 True ，否則返回 false.

示例

在下面的例子中解釋了 ios::operator！ 函數(shù)功能。

#include <iostream>     
#include <fstream>      

int main () {
  std::ifstream is;
  is.open ("test.txt");
  if (!is)
    std::cerr << "Error opening 'test.txt'/n";
  return 0;
}

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