【发布时间】：2013-01-10 17:27:17
【问题描述】：
这应该是一个重复的问题。但是我用谷歌搜索了很多，但没有找到解决我问题的方法。
我正在尝试在 osx lion 上使用 c++11 标准功能，但它不起作用。我相信这个特性被称为列表初始化器。根据http://clang.llvm.org/cxx_status.html这个功能在clang 3.1中，这是我正在使用的版本。
下面是解释我的简单测试的 shell o/p。谁能告诉我我做错了什么？我是不是忘了一面旗帜？
编译器是：
:tmp$ c++ --version
Apple clang version 3.1 (tags/Apple/clang-318.0.61) (based on LLVM 3.1svn)
Target: x86_64-apple-darwin11.4.2
Thread model: posix
:tmp$ which c++
/usr/bin/c++
:tmp$ ls -alt /usr/bin/c++
lrwxr-xr-x 1 root wheel 7 Jul 12 13:17 /usr/bin/c++ -> clang++
操作系统是
:tmp$ uname -a
Darwin .local 11.4.2 Darwin Kernel Version 11.4.2: Thu Aug 23 16:25:48 PDT 2012; root:xnu-1699.32.7~1/RELEASE_X86_64 x86_64
测试文件是
:tmp$ cat test.cpp
#include <vector>
int main(){
std::vector<int> vec1 {1,2,3};
std::vector<int> vec2={1,2,3};
}
编译器输出是
:tmp$ c++ -std=c++11 test.cpp
test.cpp:4:20: error: non-aggregate type 'std::vector<int>' cannot be
initialized with an initializer list
std::vector<int> vec1 {1,2,3};
^ ~~~~~~~
test.cpp:5:20: error: non-aggregate type 'std::vector<int>' cannot be
initialized with an initializer list
std::vector<int> vec2={1,2,3};
^ ~~~~~~~
2 errors generated.
好的，我不想到达那里，因为在 stackoverflow 上正确格式化以下内容需要很多时间。但是添加 -stdlib=c++ 会产生更多问题。现在我得到 14 个错误。
:tmp$ c++ -std=c++11 -stdlib=libc++ test.cpp
In file included from test.cpp:1:
In file included from /usr/bin/../lib/c++/v1/vector:261:
In file included from /usr/bin/../lib/c++/v1/__bit_reference:15:
In file included from /usr/bin/../lib/c++/v1/algorithm:591:
/usr/bin/../lib/c++/v1/type_traits:737:2: error: #error is_base_of not
implemented.
#error is_base_of not implemented.
^
/usr/bin/../lib/c++/v1/type_traits:1700:13: error: use of undeclared identifier
'is_base_of'
is_base_of<_Class, typename remove_reference<_Tp>::type>::value>
^
/usr/bin/../lib/c++/v1/type_traits:1700:24: error: '_Class' does not refer to a
value
is_base_of<_Class, typename remove_reference<_Tp>::type>::value>
^
/usr/bin/../lib/c++/v1/type_traits:1697:28: note: declared here
template <class _Rp, class _Class, class _Tp>
^
/usr/bin/../lib/c++/v1/type_traits:1700:62: error: expected class name
is_base_of<_Class, typename remove_reference<_Tp>::type>::value>
^
In file included from test.cpp:1:
In file included from /usr/bin/../lib/c++/v1/vector:261:
In file included from /usr/bin/../lib/c++/v1/__bit_reference:15:
In file included from /usr/bin/../lib/c++/v1/algorithm:594:
In file included from /usr/bin/../lib/c++/v1/memory:590:
In file included from /usr/bin/../lib/c++/v1/typeinfo:61:
/usr/bin/../lib/c++/v1/exception:194:20: error: use of undeclared identifier
'is_base_of'
!is_base_of<nested_exception, typename ...
^
/usr/bin/../lib/c++/v1/exception:194:31: error: 'nested_exception' does not
refer to a value
!is_base_of<nested_exception, typename ...
^
/usr/bin/../lib/c++/v1/exception:166:29: note: declared here
class _LIBCPP_EXCEPTION_ABI nested_exception
^
/usr/bin/../lib/c++/v1/exception:194:81: error: parameter declarator cannot be
qualified
...typename remove_reference<_Tp>::type>::value
~~^
/usr/bin/../lib/c++/v1/exception:194:85: error: expected ')'
...typename remove_reference<_Tp>::type>::value
^
/usr/bin/../lib/c++/v1/exception:192:18: note: to match this '('
throw_with_nested(_Tp&& __t, typename enable_if<
^
/usr/bin/../lib/c++/v1/exception:213:19: error: use of undeclared identifier
'is_base_of'
is_base_of<nested_exception, typename ...
^
/usr/bin/../lib/c++/v1/exception:213:30: error: 'nested_exception' does not
refer to a value
is_base_of<nested_exception, typename ...
^
/usr/bin/../lib/c++/v1/exception:166:29: note: declared here
class _LIBCPP_EXCEPTION_ABI nested_exception
^
/usr/bin/../lib/c++/v1/exception:213:80: error: parameter declarator cannot be
qualified
...typename remove_reference<_Tp>::type>::value
~~^
/usr/bin/../lib/c++/v1/exception:213:84: error: expected ')'
...typename remove_reference<_Tp>::type>::value
^
/usr/bin/../lib/c++/v1/exception:211:18: note: to match this '('
throw_with_nested(_Tp&& __t, typename enable_if<
^
test.cpp:4:20: error: non-aggregate type 'std::vector<int>' cannot be
initialized with an initializer list
std::vector<int> vec1 {1,2,3};
^ ~~~~~~~
test.cpp:5:20: error: non-aggregate type 'std::vector<int>' cannot be
initialized with an initializer list
std::vector<int> vec2={1,2,3};
^ ~~~~~~~
14 errors generated.
【问题讨论】：
-
第二个错误似乎是 libc++ 中的一个错误，它没有实现您正在使用的功能。尝试升级到 LLVM/Clang/libc++ 3.2
-
要正确格式化整个块，只需将其粘贴进去，然后选择整个块并按 Ctrl-K（或文本框上方的 {} 图标）
-
我有最新版本的 XCode for Lion。这是否意味着 Lion 上的 XCode 已损坏？我不想升级我的操作系统或走 darwin ports 路线。
-
@Spundun - 请注意，“Apple clang 3.1 版”与“LLVM Clang 3.1”不同。在 Mountain Lion 上，您会得到“Apple clang 4.0 版”，也是“基于 LLVM 3.1”。
标签： c++ macos osx-lion llvm llvm-3.0