' boost::phoenix::static_cast_ '与标准库混合使用

Usage of `boost::phoenix::static_cast_` mixed with standard library

本文关键字：混合 标准 cast phoenix static boost      更新时间：2023-10-16

这是一个Phoenix v3的bug。它可以很好地与Phoenix v2一起编译。我做了bug报告。我会在2天内将这个问题标记为解决。

我想用凤凰做一个简短的lamba，但是我得到了一堆编译错误。代码如下:

std::vector<unsigned char> data;
using boost::phoenix::arg_names::_1;
using boost::phoenix::static_cast_;
std::ostringstream oss;
oss << std::hex;
//Doesn't compile
std::for_each(data.begin(),data.end(), oss <<  static_cast_<unsigned int>(_1) );
//Compiles
std::for_each(data.begin(),data.end(), oss << _1 );

现在我从GCC 4.6.1中得到以下编译错误:/usr/include/boost/utility/result_of.hpp:-1: In instantiation of ‘boost::detail::result_of_nested_result<boost::phoenix::static_cast_eval, boost::phoenix::static_cast_eval(boost::proto::exprns_::basic_expr<boost::proto::tag::terminal, boost::proto::argsns_::term<boost::phoenix::detail::target<unsigned char> >, 0l>&, boost::phoenix::actor<boost::proto::exprns_::basic_expr<boost::proto::tag::terminal, boost::proto::argsns_::term<boost::phoenix::argument<1> >, 0l> >&, boost::phoenix::vector2<boost::phoenix::vector2<const boost::phoenix::actor<boost::proto::exprns_::basic_expr<boost::proto::tag::shift_left, boost::proto::argsns_::list2<boost::phoenix::actor<boost::proto::exprns_::basic_expr<boost::proto::tag::terminal, boost::proto::argsns_::term<std::basic_ostringstream<char>&>, 0l> >, boost::phoenix::actor<boost::proto::exprns_::basic_expr<boost::phoenix::tag::static_cast_, boost::proto::argsns_::list2<boost::proto::exprns_::basic_expr<boost::proto::tag::terminal, boost::proto::argsns_::term<boost::phoenix::detail::target<unsigned char> >, 0l>, boost::phoenix::actor<boost::proto::exprns_::basic_expr<boost::proto::tag::terminal, boost::proto::argsns_::term<boost::phoenix::argument<1> >, 0l> > >, 2l> > >, 2l> >*, unsigned char&>&, const boost::phoenix::default_actions&>)>’:

/usr/include/boost/phoenix/object/static_cast.hpp:29: error: declaration of ‘struct boost::phoenix::static_cast_eval::result<boost::phoenix::static_cast_eval(boost::proto::exprns_::basic_expr<boost::proto::tag::terminal, boost::proto::argsns_::term<boost::phoenix::detail::target<unsigned char> >, 0l>&, boost::phoenix::actor<boost::proto::exprns_::basic_expr<boost::proto::tag::terminal, boost::proto::argsns_::term<boost::phoenix::argument<1> >, 0l> >&, boost::phoenix::vector2<boost::phoenix::vector2<const boost::phoenix::actor<boost::proto::exprns_::basic_expr<boost::proto::tag::shift_left, boost::proto::argsns_::list2<boost::phoenix::actor<boost::proto::exprns_::basic_expr<boost::proto::tag::terminal, boost::proto::argsns_::term<std::basic_ostringstream<char>&>, 0l> >, boost::phoenix::actor<boost::proto::exprns_::basic_expr<boost::phoenix::tag::static_cast_, boost::proto::argsns_::list2<boost::proto::exprns_::basic_expr<boost::proto::tag::terminal, boost::proto::argsns_::term<boost::phoenix::detail::target<unsigned char> >, 0l>, boost::phoenix::actor<boost::proto::exprns_::basic_expr<boost::proto::tag::terminal, boost::proto::argsns_::term<boost::phoenix::argument<1> >, 0l> > >, 2l> > >, 2l> >*, unsigned char&>&, const boost::phoenix::default_actions&>)>’

/usr/include/boost/phoenix/core/detail/preprocessed/call_10.hpp:65: error: no type named ‘type’ in ‘struct boost::result_of<boost::phoenix::static_cast_eval(boost::proto::exprns_::basic_expr<boost::proto::tag::terminal, boost::proto::argsns_::term<boost::phoenix::detail::target<unsigned char> >, 0l>&, boost::phoenix::actor<boost::proto::exprns_::basic_expr<boost::proto::tag::terminal, boost::proto::argsns_::term<boost::phoenix::argument<1> >, 0l> >&, boost::phoenix::vector2<boost::phoenix::vector2<const boost::phoenix::actor<boost::proto::exprns_::basic_expr<boost::proto::tag::shift_left, boost::proto::argsns_::list2<boost::phoenix::actor<boost::proto::exprns_::basic_expr<boost::proto::tag::terminal, boost::proto::argsns_::term<std::basic_ostringstream<char>&>, 0l> >, boost::phoenix::actor<boost::proto::exprns_::basic_expr<boost::phoenix::tag::static_cast_, boost::proto::argsns_::list2<boost::proto::exprns_::basic_expr<boost::proto::tag::terminal, boost::proto::argsns_::term<boost::phoenix::detail::target<unsigned char> >, 0l>, boost::phoenix::actor<boost::proto::exprns_::basic_expr<boost::proto::tag::terminal, boost::proto::argsns_::term<boost::phoenix::argument<1> >, 0l> > >, 2l> > >, 2l> >*, unsigned char&>&, const boost::phoenix::default_actions&>)>’

两个GCC &MSVC，如果我想尝试一下，我猜违法者是:

<>之前使用boost::凤凰:arg_names: _1; 之前

还有其他具有相同名称的占位符，其中一些导入到全局作用域(例如，我相信boost::bind使用的是全局作用域)。最后一个错误特别暗示了这一点，因为似乎需要作为元函数的类型没有在某处使用。

相关文章：