如何使用 BOOST_FOREACH 枚举 BOOST_ENUM？

发布于 2024-09-30 03:05:05 字数 989 浏览 6 评论 0原文

有人可以解释一下如何使用 BOOST_FOREACH 枚举 BOOST_ENUM 吗？下面的示例表明我让它可以与 std::for_each 一起使用，但不能与 BOOST_FOREACH 一起使用。

示例代码：

BOOST_ENUM_VALUES(  MyEnum, 
  const char *, 
      (xMin)("xMin")
      (xMax)("xMax")
      (yMin)("yMin")
      (yMax)("yMax")
);

void blah(const MyEnum & val)  // working demo with std_foreach
{
  std::cout << "index=" << val.index() << " val=" << val.value() << " str=" << val.str() << std::endl;
}


void foo()
{
  //BOOST_FOREACH : does not compile...
  BOOST_FOREACH(MyEnum myEnum, MyEnum() ) // I tried to construct a "dummy" enum in order to use its iterator with no luck...
  {
    std::cout << "index=" << myEnum.index() << " val=" << myEnum.value() << " str=" << myEnum.str() << std::endl;
  }

  //std::for_each : works...
  std::for_each(MyEnum::begin(), MyEnum::end(), blah);

}

非常感谢！

编辑：正如答案中提到的，该代码确实适用于 boost 的最新代码库。

原文

Can somebody please explain me how to enumerate a BOOST_ENUM using BOOST_FOREACH ?
The example below show that I got it to work with std::for_each, but not with BOOST_FOREACH.

Sample code :

BOOST_ENUM_VALUES(  MyEnum, 
  const char *, 
      (xMin)("xMin")
      (xMax)("xMax")
      (yMin)("yMin")
      (yMax)("yMax")
);

void blah(const MyEnum & val)  // working demo with std_foreach
{
  std::cout << "index=" << val.index() << " val=" << val.value() << " str=" << val.str() << std::endl;
}


void foo()
{
  //BOOST_FOREACH : does not compile...
  BOOST_FOREACH(MyEnum myEnum, MyEnum() ) // I tried to construct a "dummy" enum in order to use its iterator with no luck...
  {
    std::cout << "index=" << myEnum.index() << " val=" << myEnum.value() << " str=" << myEnum.str() << std::endl;
  }

  //std::for_each : works...
  std::for_each(MyEnum::begin(), MyEnum::end(), blah);

}

Many thanks in advance!

Edit: as mentioned in the answer, the code does work with the newest codebase of boost.

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