我有一大堆对象(可能是1000年),我需要存储在一个容器中。我需要能够通过两种方式找到特定实例,无论是通过其ID号(64位无符号整数)还是其名称(std :: string)。一般来说,ID将是最常见的,但在某些情况下,名称是已知的,但不是ID。有多个键类型的关联数组,可能吗?
std :: map可以提供一个单独的< - >值,但是我不确定是否有两套std :: map容器,一个用于Ids,另一个用于字符串是最好的方法。
编辑 - 修改后的代码和错误:
好吧,我想我会给予多指数一试,因为我有提振反正,但我似乎无法得到它来编译即使我做了完全一样的文档中,据我可以告诉:(
测试代码:
namespace common
{
class MyBaseClass
{
public:
typedef boost::uint64_t Id;
//name and id are constant, at least for the period im intrested in
//when I want it in the container...
const std::string &getName()const{return name;}
Id getId()const{return id;}
...other stuff...
};
}
class MyClass : public common::MyBaseClass
{
...other stuff...
};
typedef boost::multi_index_container
<
MyClass*,
boost::indexed_by
<
boost::ordered_unique<boost::const_mem_fun<MyBaseClass, MyBaseClass::Id, &MyBaseClass::getId > >,
boost::ordered_unique<boost::const_mem_fun<MyBaseClass, const std::string&, &MyBaseClass::getName> >
>
>MyClassList;
和一般的升压模板错误...
c:\lib\c++\boost\boost\aligned_storage.hpp(69) : error C2872: 'detail' : ambiguous symbol
could be 'boost::detail'
or 'boost::multi_index::detail'
c:\lib\c++\boost\boost\multi_index\detail\index_node_base.hpp(42) : see reference to class template instantiation 'boost::aligned_storage' being compiled
with
[
size_=4,
alignment_=4
]
c:\lib\c++\boost\boost\multi_index\detail\index_node_base.hpp(47) : see reference to class template instantiation 'boost::multi_index::detail::pod_value_holder' being compiled
with
[
Value=MyClass *
]
c:\lib\c++\boost\boost\multi_index\detail\ord_index_node.hpp(582) : see reference to class template instantiation 'boost::multi_index::detail::index_node_base' being compiled
with
[
Value=MyClass *,
Allocator=std::allocator
]
c:\lib\c++\boost\boost\multi_index\ordered_index.hpp(137) : see reference to class template instantiation 'boost::multi_index::detail::ordered_index_node' being compiled
with
[
Super=boost::multi_index::detail::index_node_base>
]
c:\lib\c++\boost\boost\multi_index\ordered_index.hpp(119) : see reference to class template instantiation 'boost::multi_index::detail::ordered_index' being compiled
with
[
KeyFromValue=boost::multi_index::const_mem_fun,
Compare=std::less,std::allocator>>,
SuperMeta=boost::multi_index::detail::nth_layer<2,MyClass *,boost::multi_index::indexed_by>,boost::multi_index::ordered_unique>>,std::allocator>,
TagList=boost::mpl::vector0,
Category=boost::multi_index::detail::ordered_unique_tag
]
c:\lib\c++\boost\boost\multi_index_container.hpp(86) : see reference to class template instantiation 'boost::multi_index::detail::ordered_index' being compiled
with
[
KeyFromValue=boost::multi_index::const_mem_fun,
Compare=std::less,
SuperMeta=boost::multi_index::detail::nth_layer<1,MyClass *,boost::multi_index::indexed_by>,boost::multi_index::ordered_unique>>,std::allocator>,
TagList=boost::mpl::vector0,
Category=boost::multi_index::detail::ordered_unique_tag
]
c:\projects\bad_angle_studios\brak3\trunk\source\source\server\MyClass.cpp(18) : see reference to class template instantiation 'boost::multi_index::multi_index_container' being compiled
with
[
Value=MyClass *,
IndexSpecifierList=boost::multi_index::indexed_by>,boost::multi_index::ordered_unique>>
]
c:\lib\c++\boost\boost\aligned_storage.hpp(53) : error C2872: 'detail' : ambiguous symbol
could be 'boost::detail'
or 'boost::multi_index::detail'
c:\lib\c++\boost\boost\aligned_storage.hpp(56) : see reference to class template instantiation 'boost::detail::aligned_storage::aligned_storage_imp::data_t' being compiled
with
[
size_=4,
alignment_=4
]
c:\lib\c++\boost\boost\aligned_storage.hpp(69) : see reference to class template instantiation 'boost::detail::aligned_storage::aligned_storage_imp' being compiled
with
[
size_=4,
alignment_=4
]
c:\lib\c++\boost\boost\aligned_storage.hpp(73) : error C2872: 'detail' : ambiguous symbol
could be 'boost::detail'
or 'boost::multi_index::detail'
c:\projects\bad_angle_studios\brak3\trunk\source\source\server\MyClass.cpp(44) : error C2676: binary '[' : 'MyClassList' does not define this operator or a conversion to a type acceptable to the predefined operator
对不起,我的笔记本电脑上没有开发环境。如果在typedef'ing MyClassList时使用common :: MyBaseClass而不是MyClass,它会编译吗? – 2009-12-25 15:50:33
好吧,我把它改为基类,并使用“cosnt std :: string&”,但是现在我得到了一个不同的错误... – 2009-12-25 18:52:45
好吧我修改了主帖以反映他的变化和新错误 – 2009-12-25 18:56:00