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ios_base::failure

此類型被成員函數(shù)flags，setq和setq用作其參數(shù)和/或返回值。

聲明

以下是ios_base::fmtflags的聲明。

std::ios_base::fmtflags ff;

常量的值可以使用OR按位運(yùn)算符（|）組合成單個(gè)fmtflags值。

示例

下面的例子顯示了ios_base::fmtflags。

#include <iostream>

int main () {

   std::cout.setf (std::ios_base::hex , std::ios_base::basefield);
   std::cout.setf (std::ios_base::showbase);
   std::cout << 100 << '/n';

   std::cout.setf (std::ios::hex , std::ios::basefield);
   std::cout.setf (std::ios::showbase);
   std::cout << 100 << '/n';

   std::cout.setf (std::cout.hex , std::cout.basefield);
   std::cout.setf (std::cout.showbase);
   std::cout << 100 << '/n';

   std::ios_base::fmtflags ff;
   ff = std::cout.flags();
   ff &= ~std::cout.basefield;   
   ff |= std::cout.hex;          
   ff |= std::cout.showbase;     
   std::cout.flags(ff);
   std::cout << 100 << '/n';

   std::cout << std::hex << std::showbase << 100 << '/n';

   return 0;
}

編譯和運(yùn)行上面的程序，將產(chǎn)生以下結(jié)果 -

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