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std::setiosflags

STD：：Stios旗帜

Defined in header ​​
/*unspecified*/ setiosflags( std::ios_base::fmtflags mask ​​

在表达式中使用时out << setiosflags(mask)或in >> setiosflags(mask)，设置流的所有格式标志。out或in由mask...

参数

mask-bitmask of the flags to set

返回值

返回未指定类型的对象，以便在str类型的输出流的名称。std::basic_ostream<CharT, Traits>或std::basic_istream<CharT, Traits>，然后表达str << setiosflags(mask)或str >> setiosflags(mask)行为就像执行了以下代码：

str.setf(mask

例

二次

#include <iostream>
#include <iomanip>
 
int main()
{
    std::cout <<  std::resetiosflags(std::ios_base::dec) 
              <<  std::setiosflags(  std::ios_base::hex
                                   | std::ios_base::uppercase
                                   | std::ios_base::showbase) << 42 << '\n';
}

二次

产出：

二次

0X2A

二次

另见

setfsets specific format flag (public member function of std::ios_base)
resetiosflagsclears the specified ios_base flags (function)

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