c++ - boost 区域设置格式百分比

Question

我对 boost::locale::format 输出百分比有疑问。根据文档(http://www.boost.org/doc/libs/1_48_0/libs/locale/doc/html/localized_text_formatting.html):

Numbers and number manipulators

Here are the manipulators for number formatting:

as::number -- format number according to local specifications, it takes into account 
as::percent -- format number as "percent" format. For example:

        cout << as::percent << 0.25 <<endl;

Would create an output that may look like this:

    25%

但是，以下输出“0.25”:

#include <string>
#include <iostream>
#include <boost/system/system_error.hpp>
#include <boost/locale.hpp>


int main(int argc, char** argv)
{
    std::cout << boost::locale::as::percent << 0.25 <<std::endl;
}

我已经尝试通过 std::locale() 以及 boost::locale::generator 无济于事。

似乎我遗漏了一些明显的问题；有人可以暗示一下吗？

Answer 1

这对我有用:

#include <boost/locale.hpp>
#include <iostream>

int main()
{
  boost::locale::generator gen;
  std::locale loc = gen("en_US.UTF-8");
  std::cout.imbue(loc);
  std::cout << boost::locale::as::percent << 0.25 << std::endl;
  return 0;
}