C++ string格式化输出方式

#include <boost/format.hpp>

boost::format f = boost::format("%.2f %s %d") % 1.234 %"123" % 12;
  std::string s = f.str();

boost::format f = boost::format("%.2f %s %d");
  f % 1.234 %"123" % 12;
  std::string s = f.str();

CString t = L"123";
  CString s;
  s.Format(L"%.2f %s %d", 1.234, t, 12);