[英]std::any containing std::tuple<std::any> fails to compile
I realize nested std::any's are a bad idea.我意识到嵌套的 std::any 是个坏主意。 Nevertheless, I encountered something that's making me scratch my head and I'm just trying to understand why the compiler is choking.
尽管如此,我遇到了一些让我摸不着头脑的事情,我只是想了解编译器为什么会窒息。 Consider the following line of code (assuming that the
arg
variable is a std::any containing another std::any):考虑以下代码行(假设
arg
变量是包含另一个 std::any 的 std::any):
auto result = std::any_cast<std::any>(arg);
That line compiles just fine.那行编译得很好。 Now, consider this line, where I have a std::any containing a std::tuple that contains another std::any:
现在,考虑这一行,其中我有一个 std::any 包含一个 std::tuple 包含另一个 std::any:
auto result = std::any_cast<std::tuple<std::any>>(arg);
Now, the compiler blows up.现在,编译器崩溃了。 These are the errors I get:
这些是我得到的错误:
In file included from /home/james/git/trogdor-pp/src/core/event/triggers/luaeventtrigger.cpp:1:
In file included from /home/james/git/trogdor-pp/src/core/include/trogdor/game.h:5:
In file included from /usr/bin/../lib/gcc/x86_64-linux-gnu/9/../../../../include/c++/9/any:37:
In file included from /usr/bin/../lib/gcc/x86_64-linux-gnu/9/../../../../include/c++/9/new:40:
In file included from /usr/bin/../lib/gcc/x86_64-linux-gnu/9/../../../../include/c++/9/exception:144:
In file included from /usr/bin/../lib/gcc/x86_64-linux-gnu/9/../../../../include/c++/9/bits/nested_exception.h:40:
In file included from /usr/bin/../lib/gcc/x86_64-linux-gnu/9/../../../../include/c++/9/bits/move.h:55:
/usr/bin/../lib/gcc/x86_64-linux-gnu/9/../../../../include/c++/9/type_traits:132:31: error: no member named 'value' in 'std::is_copy_constructible<std::tuple<std::any> >'
: public conditional<_B1::value, _B2, _B1>::type
~~~~~^
/usr/bin/../lib/gcc/x86_64-linux-gnu/9/../../../../include/c++/9/any:170:17: note: in instantiation of template class 'std::__and_<std::is_copy_constructible<std::tuple<std::any> >, std::is_constructible<std::tuple<std::any>, const std::tuple<std::any> &> >' requested here
enable_if<__and_<is_copy_constructible<_Tp>,
^
/usr/bin/../lib/gcc/x86_64-linux-gnu/9/../../../../include/c++/9/any:175:5: note: in instantiation of template type alias '__any_constructible' requested here
using __any_constructible_t =
^
/usr/bin/../lib/gcc/x86_64-linux-gnu/9/../../../../include/c++/9/any:181:56: note: in instantiation of template type alias '__any_constructible_t' requested here
__any_constructible_t<_Tp, _ValueType&&> = true,
^
/usr/bin/../lib/gcc/x86_64-linux-gnu/9/../../../../include/c++/9/any:183:7: note: while substituting prior template arguments into non-type template parameter [with _ValueType = const std::tuple<std::any> &, _Tp = std::tuple<std::any>, _Mgr = std::any::_Manager_external<std::tuple<std::any> >]
any(_ValueType&& __value)
^~~~~~~~~~~~~~~~~~~~~~~~~
/usr/bin/../lib/gcc/x86_64-linux-gnu/9/../../../../include/c++/9/type_traits:884:56: note: while substituting deduced template arguments into function template 'any' [with _ValueType = const std::tuple<std::any> &, _Tp = (no value), _Mgr = (no value), $3 = (no value), $4 = (no value)]
: public __bool_constant<__is_constructible(_Tp, _Args...)>
^
/usr/bin/../lib/gcc/x86_64-linux-gnu/9/../../../../include/c++/9/type_traits:884:32: note: (skipping 2 contexts in backtrace; use -ftemplate-backtrace-limit=0 to see all)
: public __bool_constant<__is_constructible(_Tp, _Args...)>
^
/usr/bin/../lib/gcc/x86_64-linux-gnu/9/../../../../include/c++/9/type_traits:908:14: note: in instantiation of template class 'std::__is_copy_constructible_impl<std::tuple<std::any>, true>' requested here
: public __is_copy_constructible_impl<_Tp>
^
/usr/bin/../lib/gcc/x86_64-linux-gnu/9/../../../../include/c++/9/type_traits:109:14: note: in instantiation of template class 'std::is_copy_constructible<std::tuple<std::any> >' requested here
: public conditional<_B1::value, _B1, _B2>::type
^
/usr/bin/../lib/gcc/x86_64-linux-gnu/9/../../../../include/c++/9/any:358:16: note: in instantiation of template class 'std::__or_<std::is_reference<std::tuple<std::any> >, std::is_copy_constructible<std::tuple<std::any> > >' requested here
{ return __or_<is_reference<_Tp>, is_copy_constructible<_Tp>>::value; }
^
/usr/bin/../lib/gcc/x86_64-linux-gnu/9/../../../../include/c++/9/any:481:26: note: in instantiation of function template specialization 'std::any::__is_valid_cast<std::tuple<std::any> >' requested here
static_assert(any::__is_valid_cast<_ValueType>(),
^
/home/james/git/trogdor-pp/src/core/event/triggers/luaeventtrigger.cpp:42:32: note: in instantiation of function template specialization 'std::any_cast<std::tuple<std::any> >' requested here
auto arg = std::any_cast<std::tuple<std::any>>(a);
^
In file included from /home/james/git/trogdor-pp/src/core/event/triggers/luaeventtrigger.cpp:1:
In file included from /home/james/git/trogdor-pp/src/core/include/trogdor/game.h:5:
In file included from /usr/bin/../lib/gcc/x86_64-linux-gnu/9/../../../../include/c++/9/any:37:
In file included from /usr/bin/../lib/gcc/x86_64-linux-gnu/9/../../../../include/c++/9/new:40:
In file included from /usr/bin/../lib/gcc/x86_64-linux-gnu/9/../../../../include/c++/9/exception:144:
In file included from /usr/bin/../lib/gcc/x86_64-linux-gnu/9/../../../../include/c++/9/bits/nested_exception.h:40:
In file included from /usr/bin/../lib/gcc/x86_64-linux-gnu/9/../../../../include/c++/9/bits/move.h:55:
/usr/bin/../lib/gcc/x86_64-linux-gnu/9/../../../../include/c++/9/type_traits:137:31: error: no member named 'value' in 'std::is_copy_constructible<std::tuple<std::any> >'
: public conditional<_B1::value, __and_<_B2, _B3, _Bn...>, _B1>::type
~~~~~^
/usr/bin/../lib/gcc/x86_64-linux-gnu/9/../../../../include/c++/9/type_traits:150:37: note: in instantiation of template class 'std::__and_<std::is_copy_constructible<std::tuple<std::any> >, std::__not_<std::is_constructible<std::tuple<std::any>, const std::tuple<std::any> &> >, std::__not_<std::__is_in_place_type<std::tuple<std::any> > > >' requested here
inline constexpr bool __and_v = __and_<_Bn...>::value;
^
/usr/bin/../lib/gcc/x86_64-linux-gnu/9/../../../../include/c++/9/any:192:27: note: in instantiation of variable template specialization 'std::__and_v<std::is_copy_constructible<std::tuple<std::any> >, std::__not_<std::is_constructible<std::tuple<std::any>, const std::tuple<std::any> &> >, std::__not_<std::__is_in_place_type<std::tuple<std::any> > > >' requested here
enable_if_t<__and_v<is_copy_constructible<_Tp>,
^
/usr/bin/../lib/gcc/x86_64-linux-gnu/9/../../../../include/c++/9/any:196:7: note: while substituting prior template arguments into non-type template parameter [with _ValueType = const std::tuple<std::any> &, _Tp = std::tuple<std::any>, _Mgr = std::any::_Manager_external<std::tuple<std::any> >]
any(_ValueType&& __value)
^~~~~~~~~~~~~~~~~~~~~~~~~
/usr/bin/../lib/gcc/x86_64-linux-gnu/9/../../../../include/c++/9/type_traits:884:56: note: while substituting deduced template arguments into function template 'any' [with _ValueType = const std::tuple<std::any> &, _Tp = (no value), _Mgr = (no value), $3 = (no value)]
: public __bool_constant<__is_constructible(_Tp, _Args...)>
^
/usr/bin/../lib/gcc/x86_64-linux-gnu/9/../../../../include/c++/9/type_traits:884:32: note: while substituting deduced template arguments into function template 'tuple' [with _Dummy = (no value), $1 = (no value)]
: public __bool_constant<__is_constructible(_Tp, _Args...)>
^
/usr/bin/../lib/gcc/x86_64-linux-gnu/9/../../../../include/c++/9/type_traits:902:14: note: (skipping 1 context in backtrace; use -ftemplate-backtrace-limit=0 to see all)
: public is_constructible<_Tp, const _Tp&>
^
/usr/bin/../lib/gcc/x86_64-linux-gnu/9/../../../../include/c++/9/type_traits:908:14: note: in instantiation of template class 'std::__is_copy_constructible_impl<std::tuple<std::any>, true>' requested here
: public __is_copy_constructible_impl<_Tp>
^
/usr/bin/../lib/gcc/x86_64-linux-gnu/9/../../../../include/c++/9/type_traits:109:14: note: in instantiation of template class 'std::is_copy_constructible<std::tuple<std::any> >' requested here
: public conditional<_B1::value, _B1, _B2>::type
^
/usr/bin/../lib/gcc/x86_64-linux-gnu/9/../../../../include/c++/9/any:358:16: note: in instantiation of template class 'std::__or_<std::is_reference<std::tuple<std::any> >, std::is_copy_constructible<std::tuple<std::any> > >' requested here
{ return __or_<is_reference<_Tp>, is_copy_constructible<_Tp>>::value; }
^
/usr/bin/../lib/gcc/x86_64-linux-gnu/9/../../../../include/c++/9/any:481:26: note: in instantiation of function template specialization 'std::any::__is_valid_cast<std::tuple<std::any> >' requested here
static_assert(any::__is_valid_cast<_ValueType>(),
^
/home/james/git/trogdor-pp/src/core/event/triggers/luaeventtrigger.cpp:42:32: note: in instantiation of function template specialization 'std::any_cast<std::tuple<std::any> >' requested here
auto arg = std::any_cast<std::tuple<std::any>>(a);
I'm having a hard time unpacking all of that and figuring out what's wrong and how I can fix it.我很难解开所有这些并找出问题所在以及如何解决它。
EDIT: we've discovered in the comments that this code does not compile under G++ 9 and below, but compiles on G++ 10 and above, and also fails on clang 10 and below, but compiles on clang 11 and above. EDIT: we've discovered in the comments that this code does not compile under G++ 9 and below, but compiles on G++ 10 and above, and also fails on clang 10 and below, but compiles on clang 11 and above. Does anybody have any guesses as to why this might be the case?
有没有人猜测为什么会出现这种情况?
The key part is error: no member named 'value' in 'std::is_copy_constructible<std::tuple<std::any> >'
关键部分是错误:
no member named 'value' in 'std::is_copy_constructible<std::tuple<std::any> >'
This is the compiler's way of complaining that the indicated object, the std::tuple
, is not copy-constructible.这是编译器抱怨指示的 object 的方式,即
std::tuple
不可复制构造。
Your gcc does not believe, apparently, that std::tuplestd::any is copy-constructible.您的 gcc 显然不相信 std::tuplesd::any 是可复制构造的。 A tuple, in of itself, should be copy constructible if everything in the tuple is copy-constructible.
如果元组中的所有内容都是可复制构造的,则元组本身应该是可复制构造的。 Given that
std::any
is C++17, and gcc 9's C++17 support is incomplete, at least incomplete insofar as this part of C++17 goes (gcc 11's feature list still includes some C++17 features). Given that
std::any
is C++17, and gcc 9's C++17 support is incomplete, at least incomplete insofar as this part of C++17 goes (gcc 11's feature list still includes some C++17 features).
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