'boost::detail::variant::visitation_impl': 2 个重载都不能转换所有参数类型

Question

我无法使用 Boost 库 1.61.0 和 Visual Studio 2015 Update 3 构建我的两个项目。

多年来，这些项目使用 Visual Studio 和 Boost 版本的各种组合构建良好，除了更新 Visual Studio 和 Boost 库外，我没有更改代码中的任何内容。

我在这两个项目中遇到的错误是：

'boost::detail::variant::visitation_impl': none of the 2 overloads could convert all the argument types

在这两个项目中，我都没有直接从我的代码中使用 boost::variant。在一种情况下，它看起来像是从 boost::signals2 使用 boost::variant （我也没有直接从我的代码中使用它），而在另一种情况下，它看起来像是从 Cpp-Netlib 使用 boost::variant 0.11.2.

以下是这两个项目输出日志的相关部分：

---

1>d:\libraries\boost_1_61_0\boost\variant\detail\visitation_impl.hpp(267): error C2665: 'boost::detail::variant::visitation_impl': none of the 2 overloads could convert all the argument types
1>  d:\libraries\boost_1_61_0\boost\variant\detail\visitation_impl.hpp(201): note: could be 'void boost::detail::variant::visitation_impl<next_which,next_step,Visitor,VoidPtrCV,NoBackupFlag>(const int,const int,Visitor &,VoidPtrCV,boost::mpl::false_,NoBackupFlag,Which *,step0 *)'
1>          with
1>          [
1>              Visitor=boost::detail::variant::destroyer,
1>              VoidPtrCV=void *,
1>              NoBackupFlag=boost::variant<boost::shared_ptr<void>,boost::signals2::detail::foreign_void_shared_ptr,boost::detail::variant::void_,boost::detail::variant::void_,boost::detail::variant::void_,boost::detail::variant::void_,boost::detail::variant::void_,boost::detail::variant::void_,boost::detail::variant::void_,boost::detail::variant::void_,boost::detail::variant::void_,boost::detail::variant::void_,boost::detail::variant::void_,boost::detail::variant::void_,boost::detail::variant::void_,boost::detail::variant::void_,boost::detail::variant::void_,boost::detail::variant::void_,boost::detail::variant::void_,boost::detail::variant::void_>::has_fallback_type_,
1>              Which=next_which,
1>              step0=next_step
1>          ]
1>  d:\libraries\boost_1_61_0\boost\variant\detail\visitation_impl.hpp(183): note: or       'void boost::detail::variant::visitation_impl<next_which,next_step,Visitor,VoidPtrCV,NoBackupFlag>(int,int,Visitor &,VPCV,boost::mpl::true_,NBF,W *,S *)'
1>          with
1>          [
1>              Visitor=boost::detail::variant::destroyer,
1>              VoidPtrCV=void *,
1>              NoBackupFlag=boost::variant<boost::shared_ptr<void>,boost::signals2::detail::foreign_void_shared_ptr,boost::detail::variant::void_,boost::detail::variant::void_,boost::detail::variant::void_,boost::detail::variant::void_,boost::detail::variant::void_,boost::detail::variant::void_,boost::detail::variant::void_,boost::detail::variant::void_,boost::detail::variant::void_,boost::detail::variant::void_,boost::detail::variant::void_,boost::detail::variant::void_,boost::detail::variant::void_,boost::detail::variant::void_,boost::detail::variant::void_,boost::detail::variant::void_,boost::detail::variant::void_,boost::detail::variant::void_>::has_fallback_type_,
1>              VPCV=void *,
1>              NBF=boost::variant<boost::shared_ptr<void>,boost::signals2::detail::foreign_void_shared_ptr,boost::detail::variant::void_,boost::detail::variant::void_,boost::detail::variant::void_,boost::detail::variant::void_,boost::detail::variant::void_,boost::detail::variant::void_,boost::detail::variant::void_,boost::detail::variant::void_,boost::detail::variant::void_,boost::detail::variant::void_,boost::detail::variant::void_,boost::detail::variant::void_,boost::detail::variant::void_,boost::detail::variant::void_,boost::detail::variant::void_,boost::detail::variant::void_,boost::detail::variant::void_,boost::detail::variant::void_>::has_fallback_type_,
1>              W=next_which,
1>              S=next_step
1>          ]
1>  d:\libraries\boost_1_61_0\boost\variant\detail\visitation_impl.hpp(267): note: while trying to match the argument list '(const int, const int, boost::detail::variant::destroyer, void *, is_apply_visitor_unrolled, boost::variant<boost::shared_ptr<void>,boost::signals2::detail::foreign_void_shared_ptr,boost::detail::variant::void_,boost::detail::variant::void_,boost::detail::variant::void_,boost::detail::variant::void_,boost::detail::variant::void_,boost::detail::variant::void_,boost::detail::variant::void_,boost::detail::variant::void_,boost::detail::variant::void_,boost::detail::variant::void_,boost::detail::variant::void_,boost::detail::variant::void_,boost::detail::variant::void_,boost::detail::variant::void_,boost::detail::variant::void_,boost::detail::variant::void_,boost::detail::variant::void_,boost::detail::variant::void_>::has_fallback_type_, next_which *, next_step *)'
1>  d:\libraries\boost_1_61_0\boost\variant\variant.hpp(2326): note: see reference to function template instantiation 'void boost::detail::variant::visitation_impl<first_which,first_step,Visitor,VoidPtrCV,boost::variant<boost::shared_ptr<void>,boost::signals2::detail::foreign_void_shared_ptr,boost::detail::variant::void_,boost::detail::variant::void_,boost::detail::variant::void_,boost::detail::variant::void_,boost::detail::variant::void_,boost::detail::variant::void_,boost::detail::variant::void_,boost::detail::variant::void_,boost::detail::variant::void_,boost::detail::variant::void_,boost::detail::variant::void_,boost::detail::variant::void_,boost::detail::variant::void_,boost::detail::variant::void_,boost::detail::variant::void_,boost::detail::variant::void_,boost::detail::variant::void_,boost::detail::variant::void_>::has_fallback_type_>(const int,const int,Visitor &,VoidPtrCV,boost::mpl::false_,NoBackupFlag,Which *,step0 *)' being compiled
1>          with
1>          [
1>              Visitor=boost::detail::variant::destroyer,
1>              VoidPtrCV=void *,
1>              NoBackupFlag=boost::variant<boost::shared_ptr<void>,boost::signals2::detail::foreign_void_shared_ptr,boost::detail::variant::void_,boost::detail::variant::void_,boost::detail::variant::void_,boost::detail::variant::void_,boost::detail::variant::void_,boost::detail::variant::void_,boost::detail::variant::void_,boost::detail::variant::void_,boost::detail::variant::void_,boost::detail::variant::void_,boost::detail::variant::void_,boost::detail::variant::void_,boost::detail::variant::void_,boost::detail::variant::void_,boost::detail::variant::void_,boost::detail::variant::void_,boost::detail::variant::void_,boost::detail::variant::void_>::has_fallback_type_,
1>              Which=first_which,
1>              step0=first_step
1>          ]
1>  d:\libraries\boost_1_61_0\boost\variant\variant.hpp(2337): note: see reference to function template instantiation 'void boost::variant<boost::shared_ptr<void>,boost::signals2::detail::foreign_void_shared_ptr,boost::detail::variant::void_,boost::detail::variant::void_,boost::detail::variant::void_,boost::detail::variant::void_,boost::detail::variant::void_,boost::detail::variant::void_,boost::detail::variant::void_,boost::detail::variant::void_,boost::detail::variant::void_,boost::detail::variant::void_,boost::detail::variant::void_,boost::detail::variant::void_,boost::detail::variant::void_,boost::detail::variant::void_,boost::detail::variant::void_,boost::detail::variant::void_,boost::detail::variant::void_,boost::detail::variant::void_>::internal_apply_visitor_impl<Visitor,void*>(int,int,Visitor &,VoidPtrCV)' being compiled
1>          with
1>          [
1>              Visitor=boost::detail::variant::destroyer,
1>              VoidPtrCV=void *
1>          ]
1>  d:\libraries\boost_1_61_0\boost\variant\variant.hpp(2335): note: see reference to function template instantiation 'void boost::variant<boost::shared_ptr<void>,boost::signals2::detail::foreign_void_shared_ptr,boost::detail::variant::void_,boost::detail::variant::void_,boost::detail::variant::void_,boost::detail::variant::void_,boost::detail::variant::void_,boost::detail::variant::void_,boost::detail::variant::void_,boost::detail::variant::void_,boost::detail::variant::void_,boost::detail::variant::void_,boost::detail::variant::void_,boost::detail::variant::void_,boost::detail::variant::void_,boost::detail::variant::void_,boost::detail::variant::void_,boost::detail::variant::void_,boost::detail::variant::void_,boost::detail::variant::void_>::internal_apply_visitor_impl<Visitor,void*>(int,int,Visitor &,VoidPtrCV)' being compiled
1>          with
1>          [
1>              Visitor=boost::detail::variant::destroyer,
1>              VoidPtrCV=void *
1>          ]
1>  d:\libraries\boost_1_61_0\boost\variant\variant.hpp(1345): note: see reference to function template instantiation 'void boost::variant<boost::shared_ptr<void>,boost::signals2::detail::foreign_void_shared_ptr,boost::detail::variant::void_,boost::detail::variant::void_,boost::detail::variant::void_,boost::detail::variant::void_,boost::detail::variant::void_,boost::detail::variant::void_,boost::detail::variant::void_,boost::detail::variant::void_,boost::detail::variant::void_,boost::detail::variant::void_,boost::detail::variant::void_,boost::detail::variant::void_,boost::detail::variant::void_,boost::detail::variant::void_,boost::detail::variant::void_,boost::detail::variant::void_,boost::detail::variant::void_,boost::detail::variant::void_>::internal_apply_visitor<boost::detail::variant::destroyer>(Visitor &)' being compiled
1>          with
1>          [
1>              Visitor=boost::detail::variant::destroyer
1>          ]
1>  d:\libraries\boost_1_61_0\boost\variant\variant.hpp(1345): note: see reference to function template instantiation 'void boost::variant<boost::shared_ptr<void>,boost::signals2::detail::foreign_void_shared_ptr,boost::detail::variant::void_,boost::detail::variant::void_,boost::detail::variant::void_,boost::detail::variant::void_,boost::detail::variant::void_,boost::detail::variant::void_,boost::detail::variant::void_,boost::detail::variant::void_,boost::detail::variant::void_,boost::detail::variant::void_,boost::detail::variant::void_,boost::detail::variant::void_,boost::detail::variant::void_,boost::detail::variant::void_,boost::detail::variant::void_,boost::detail::variant::void_,boost::detail::variant::void_,boost::detail::variant::void_>::internal_apply_visitor<boost::detail::variant::destroyer>(Visitor &)' being compiled
1>          with
1>          [
1>              Visitor=boost::detail::variant::destroyer
1>          ]
1>  d:\libraries\boost_1_61_0\boost\variant\variant.hpp(1343): note: while compiling class template member function 'void boost::variant<boost::shared_ptr<void>,boost::signals2::detail::foreign_void_shared_ptr,boost::detail::variant::void_,boost::detail::variant::void_,boost::detail::variant::void_,boost::detail::variant::void_,boost::detail::variant::void_,boost::detail::variant::void_,boost::detail::variant::void_,boost::detail::variant::void_,boost::detail::variant::void_,boost::detail::variant::void_,boost::detail::variant::void_,boost::detail::variant::void_,boost::detail::variant::void_,boost::detail::variant::void_,boost::detail::variant::void_,boost::detail::variant::void_,boost::detail::variant::void_,boost::detail::variant::void_>::destroy_content(void) noexcept'
1>  d:\libraries\boost_1_61_0\boost\variant\variant.hpp(1352): note: see reference to function template instantiation 'void boost::variant<boost::shared_ptr<void>,boost::signals2::detail::foreign_void_shared_ptr,boost::detail::variant::void_,boost::detail::variant::void_,boost::detail::variant::void_,boost::detail::variant::void_,boost::detail::variant::void_,boost::detail::variant::void_,boost::detail::variant::void_,boost::detail::variant::void_,boost::detail::variant::void_,boost::detail::variant::void_,boost::detail::variant::void_,boost::detail::variant::void_,boost::detail::variant::void_,boost::detail::variant::void_,boost::detail::variant::void_,boost::detail::variant::void_,boost::detail::variant::void_,boost::detail::variant::void_>::destroy_content(void) noexcept' being compiled
1>  d:\libraries\boost_1_61_0\boost\signals2\slot_base.hpp(47): note: see reference to class template instantiation 'boost::variant<boost::shared_ptr<void>,boost::signals2::detail::foreign_void_shared_ptr,boost::detail::variant::void_,boost::detail::variant::void_,boost::detail::variant::void_,boost::detail::variant::void_,boost::detail::variant::void_,boost::detail::variant::void_,boost::detail::variant::void_,boost::detail::variant::void_,boost::detail::variant::void_,boost::detail::variant::void_,boost::detail::variant::void_,boost::detail::variant::void_,boost::detail::variant::void_,boost::detail::variant::void_,boost::detail::variant::void_,boost::detail::variant::void_,boost::detail::variant::void_,boost::detail::variant::void_>' being compiled

---

1>d:\libraries\boost_1_61_0\boost\variant\detail\visitation_impl.hpp(267): error C2665: 'boost::detail::variant::visitation_impl': none of the 2 overloads could convert all the argument types
1>  d:\libraries\boost_1_61_0\boost\variant\detail\visitation_impl.hpp(201): note: could be 'void boost::detail::variant::visitation_impl<next_which,next_step,Visitor,VoidPtrCV,NoBackupFlag>(const int,const int,Visitor &,VoidPtrCV,boost::mpl::false_,NoBackupFlag,Which *,step0 *)'
1>          with
1>          [
1>              Visitor=boost::detail::variant::copy_into,
1>              VoidPtrCV=const void *,
1>              NoBackupFlag=boost::variant<uint16_t,boost::shared_future<uint16_t>,boost::detail::variant::void_,boost::detail::variant::void_,boost::detail::variant::void_,boost::detail::variant::void_,boost::detail::variant::void_,boost::detail::variant::void_,boost::detail::variant::void_,boost::detail::variant::void_,boost::detail::variant::void_,boost::detail::variant::void_,boost::detail::variant::void_,boost::detail::variant::void_,boost::detail::variant::void_,boost::detail::variant::void_,boost::detail::variant::void_,boost::detail::variant::void_,boost::detail::variant::void_,boost::detail::variant::void_>::has_fallback_type_,
1>              Which=next_which,
1>              step0=next_step
1>          ]
1>  d:\libraries\boost_1_61_0\boost\variant\detail\visitation_impl.hpp(183): note: or       'void boost::detail::variant::visitation_impl<next_which,next_step,Visitor,VoidPtrCV,NoBackupFlag>(int,int,Visitor &,VPCV,boost::mpl::true_,NBF,W *,S *)'
1>          with
1>          [
1>              Visitor=boost::detail::variant::copy_into,
1>              VoidPtrCV=const void *,
1>              NoBackupFlag=boost::variant<uint16_t,boost::shared_future<uint16_t>,boost::detail::variant::void_,boost::detail::variant::void_,boost::detail::variant::void_,boost::detail::variant::void_,boost::detail::variant::void_,boost::detail::variant::void_,boost::detail::variant::void_,boost::detail::variant::void_,boost::detail::variant::void_,boost::detail::variant::void_,boost::detail::variant::void_,boost::detail::variant::void_,boost::detail::variant::void_,boost::detail::variant::void_,boost::detail::variant::void_,boost::detail::variant::void_,boost::detail::variant::void_,boost::detail::variant::void_>::has_fallback_type_,
1>              VPCV=const void *,
1>              NBF=boost::variant<uint16_t,boost::shared_future<uint16_t>,boost::detail::variant::void_,boost::detail::variant::void_,boost::detail::variant::void_,boost::detail::variant::void_,boost::detail::variant::void_,boost::detail::variant::void_,boost::detail::variant::void_,boost::detail::variant::void_,boost::detail::variant::void_,boost::detail::variant::void_,boost::detail::variant::void_,boost::detail::variant::void_,boost::detail::variant::void_,boost::detail::variant::void_,boost::detail::variant::void_,boost::detail::variant::void_,boost::detail::variant::void_,boost::detail::variant::void_>::has_fallback_type_,
1>              W=next_which,
1>              S=next_step
1>          ]
1>  d:\libraries\boost_1_61_0\boost\variant\detail\visitation_impl.hpp(267): note: while trying to match the argument list '(const int, const int, boost::detail::variant::copy_into, const void *, is_apply_visitor_unrolled, boost::variant<uint16_t,boost::shared_future<uint16_t>,boost::detail::variant::void_,boost::detail::variant::void_,boost::detail::variant::void_,boost::detail::variant::void_,boost::detail::variant::void_,boost::detail::variant::void_,boost::detail::variant::void_,boost::detail::variant::void_,boost::detail::variant::void_,boost::detail::variant::void_,boost::detail::variant::void_,boost::detail::variant::void_,boost::detail::variant::void_,boost::detail::variant::void_,boost::detail::variant::void_,boost::detail::variant::void_,boost::detail::variant::void_,boost::detail::variant::void_>::has_fallback_type_, next_which *, next_step *)'
1>  d:\libraries\boost_1_61_0\boost\variant\variant.hpp(2326): note: see reference to function template instantiation 'void boost::detail::variant::visitation_impl<first_which,first_step,Visitor,VoidPtrCV,boost::variant<uint16_t,boost::shared_future<uint16_t>,boost::detail::variant::void_,boost::detail::variant::void_,boost::detail::variant::void_,boost::detail::variant::void_,boost::detail::variant::void_,boost::detail::variant::void_,boost::detail::variant::void_,boost::detail::variant::void_,boost::detail::variant::void_,boost::detail::variant::void_,boost::detail::variant::void_,boost::detail::variant::void_,boost::detail::variant::void_,boost::detail::variant::void_,boost::detail::variant::void_,boost::detail::variant::void_,boost::detail::variant::void_,boost::detail::variant::void_>::has_fallback_type_>(const int,const int,Visitor &,VoidPtrCV,boost::mpl::false_,NoBackupFlag,Which *,step0 *)' being compiled
1>          with
1>          [
1>              Visitor=boost::detail::variant::copy_into,
1>              VoidPtrCV=const void *,
1>              NoBackupFlag=boost::variant<uint16_t,boost::shared_future<uint16_t>,boost::detail::variant::void_,boost::detail::variant::void_,boost::detail::variant::void_,boost::detail::variant::void_,boost::detail::variant::void_,boost::detail::variant::void_,boost::detail::variant::void_,boost::detail::variant::void_,boost::detail::variant::void_,boost::detail::variant::void_,boost::detail::variant::void_,boost::detail::variant::void_,boost::detail::variant::void_,boost::detail::variant::void_,boost::detail::variant::void_,boost::detail::variant::void_,boost::detail::variant::void_,boost::detail::variant::void_>::has_fallback_type_,
1>              Which=first_which,
1>              step0=first_step
1>          ]
1>  d:\libraries\boost_1_61_0\boost\variant\variant.hpp(2348): note: see reference to function template instantiation 'void boost::variant<uint16_t,boost::shared_future<uint16_t>,boost::detail::variant::void_,boost::detail::variant::void_,boost::detail::variant::void_,boost::detail::variant::void_,boost::detail::variant::void_,boost::detail::variant::void_,boost::detail::variant::void_,boost::detail::variant::void_,boost::detail::variant::void_,boost::detail::variant::void_,boost::detail::variant::void_,boost::detail::variant::void_,boost::detail::variant::void_,boost::detail::variant::void_,boost::detail::variant::void_,boost::detail::variant::void_,boost::detail::variant::void_,boost::detail::variant::void_>::internal_apply_visitor_impl<Visitor,const void*>(int,int,Visitor &,VoidPtrCV)' being compiled
1>          with
1>          [
1>              Visitor=boost::detail::variant::copy_into,
1>              VoidPtrCV=const void *
1>          ]
1>  d:\libraries\boost_1_61_0\boost\variant\variant.hpp(2346): note: see reference to function template instantiation 'void boost::variant<uint16_t,boost::shared_future<uint16_t>,boost::detail::variant::void_,boost::detail::variant::void_,boost::detail::variant::void_,boost::detail::variant::void_,boost::detail::variant::void_,boost::detail::variant::void_,boost::detail::variant::void_,boost::detail::variant::void_,boost::detail::variant::void_,boost::detail::variant::void_,boost::detail::variant::void_,boost::detail::variant::void_,boost::detail::variant::void_,boost::detail::variant::void_,boost::detail::variant::void_,boost::detail::variant::void_,boost::detail::variant::void_,boost::detail::variant::void_>::internal_apply_visitor_impl<Visitor,const void*>(int,int,Visitor &,VoidPtrCV)' being compiled
1>          with
1>          [
1>              Visitor=boost::detail::variant::copy_into,
1>              VoidPtrCV=const void *
1>          ]
1>  d:\libraries\boost_1_61_0\boost\variant\variant.hpp(1746): note: see reference to function template instantiation 'void boost::variant<uint16_t,boost::shared_future<uint16_t>,boost::detail::variant::void_,boost::detail::variant::void_,boost::detail::variant::void_,boost::detail::variant::void_,boost::detail::variant::void_,boost::detail::variant::void_,boost::detail::variant::void_,boost::detail::variant::void_,boost::detail::variant::void_,boost::detail::variant::void_,boost::detail::variant::void_,boost::detail::variant::void_,boost::detail::variant::void_,boost::detail::variant::void_,boost::detail::variant::void_,boost::detail::variant::void_,boost::detail::variant::void_,boost::detail::variant::void_>::internal_apply_visitor<boost::detail::variant::copy_into>(Visitor &) const' being compiled
1>          with
1>          [
1>              Visitor=boost::detail::variant::copy_into
1>          ]
1>  d:\libraries\boost_1_61_0\boost\variant\variant.hpp(1746): note: see reference to function template instantiation 'void boost::variant<uint16_t,boost::shared_future<uint16_t>,boost::detail::variant::void_,boost::detail::variant::void_,boost::detail::variant::void_,boost::detail::variant::void_,boost::detail::variant::void_,boost::detail::variant::void_,boost::detail::variant::void_,boost::detail::variant::void_,boost::detail::variant::void_,boost::detail::variant::void_,boost::detail::variant::void_,boost::detail::variant::void_,boost::detail::variant::void_,boost::detail::variant::void_,boost::detail::variant::void_,boost::detail::variant::void_,boost::detail::variant::void_,boost::detail::variant::void_>::internal_apply_visitor<boost::detail::variant::copy_into>(Visitor &) const' being compiled
1>          with
1>          [
1>              Visitor=boost::detail::variant::copy_into
1>          ]
1>  d:\libraries\boost_1_61_0\boost\variant\variant.hpp(1742): note: while compiling class template member function 'boost::variant<uint16_t,boost::shared_future<uint16_t>,boost::detail::variant::void_,boost::detail::variant::void_,boost::detail::variant::void_,boost::detail::variant::void_,boost::detail::variant::void_,boost::detail::variant::void_,boost::detail::variant::void_,boost::detail::variant::void_,boost::detail::variant::void_,boost::detail::variant::void_,boost::detail::variant::void_,boost::detail::variant::void_,boost::detail::variant::void_,boost::detail::variant::void_,boost::detail::variant::void_,boost::detail::variant::void_,boost::detail::variant::void_,boost::detail::variant::void_>::variant(const boost::variant<uint16_t,boost::shared_future<uint16_t>,boost::detail::variant::void_,boost::detail::variant::void_,boost::detail::variant::void_,boost::detail::variant::void_,boost::detail::variant::void_,boost::detail::variant::void_,boost::detail::variant::void_,boost::detail::variant::void_,boost::detail::variant::void_,boost::detail::variant::void_,boost::detail::variant::void_,boost::detail::variant::void_,boost::detail::variant::void_,boost::detail::variant::void_,boost::detail::variant::void_,boost::detail::variant::void_,boost::detail::variant::void_,boost::detail::variant::void_> &)'
1>  d:\libraries\cpp-netlib-0.11.2-final\build\install\include\boost\network\protocol\http\message\directives\status.hpp(36): note: see reference to function template instantiation 'boost::variant<uint16_t,boost::shared_future<uint16_t>,boost::detail::variant::void_,boost::detail::variant::void_,boost::detail::variant::void_,boost::detail::variant::void_,boost::detail::variant::void_,boost::detail::variant::void_,boost::detail::variant::void_,boost::detail::variant::void_,boost::detail::variant::void_,boost::detail::variant::void_,boost::detail::variant::void_,boost::detail::variant::void_,boost::detail::variant::void_,boost::detail::variant::void_,boost::detail::variant::void_,boost::detail::variant::void_,boost::detail::variant::void_,boost::detail::variant::void_>::variant(const boost::variant<uint16_t,boost::shared_future<uint16_t>,boost::detail::variant::void_,boost::detail::variant::void_,boost::detail::variant::void_,boost::detail::variant::void_,boost::detail::variant::void_,boost::detail::variant::void_,boost::detail::variant::void_,boost::detail::variant::void_,boost::detail::variant::void_,boost::detail::variant::void_,boost::detail::variant::void_,boost::detail::variant::void_,boost::detail::variant::void_,boost::detail::variant::void_,boost::detail::variant::void_,boost::detail::variant::void_,boost::detail::variant::void_,boost::detail::variant::void_> &)' being compiled
1>  d:\libraries\cpp-netlib-0.11.2-final\build\install\include\boost\network\protocol\http\message\directives\status.hpp(29): note: see reference to class template instantiation 'boost::variant<uint16_t,boost::shared_future<uint16_t>,boost::detail::variant::void_,boost::detail::variant::void_,boost::detail::variant::void_,boost::detail::variant::void_,boost::detail::variant::void_,boost::detail::variant::void_,boost::detail::variant::void_,boost::detail::variant::void_,boost::detail::variant::void_,boost::detail::variant::void_,boost::detail::variant::void_,boost::detail::variant::void_,boost::detail::variant::void_,boost::detail::variant::void_,boost::detail::variant::void_,boost::detail::variant::void_,boost::detail::variant::void_,boost::detail::variant::void_>' being compiled

---

这是 boost 库中的错误吗？

Answer 1

听起来您的 Boost 安装已损坏。您是否保留了多个版本的 Boost？有多个 Boost 1.61.0 和 Visual Studio 2015 update 3 在网络上成功协同工作的示例，though this one does say there are some issues with the new SFINAE feature。

尝试删除旧的 Boost 安装并全新安装 Boost 1.61.0 from the Boost distribution。

Visual Studio 也有可能在安装或更新期间损坏，但我发现此类问题较少。