c++ - multi_index 模板编译错误

Question

2个问题:
1. 我真的需要通过成员将参数传递给 modify/modify_key 吗？
2. 为什么会出现这个编译错误

要查看包含错误的完整代码，您可以查看http://coliru.stacked-crooked.com/a/d6241361318e1925。

错误是

MultiIndex4.h: In member function 'uint32_t CrMultiParameterMultiIndex::ModifyKeyBy(SearchingKey&, ModifyKeyType&) [with SearchingTagType = IMEI_tag, ModifyingTagType = IMEI_tag, SearchingKey = uint32_t, ModifyKeyType = uint32_t]':
MultiIndex4.h:183:   instantiated from here
MultiIndex4.h:119: error: no matching function for call to 'boost::multi_index::multi_index_container<UsersKey, UsersKey_indices, std::allocator<UsersKey> >::modify_key(boost::multi_index::detail::bidir_node_iterator<boost::multi_index::detail::ordered_index_node<boost::multi_index::detail::index_node_base<UsersKey, std::allocator<UsersKey> > > >&, boost::function<void ()(uint32_t&)>&)'
*** Errors occurred during this build ***

我有一个 CrMultiParameterMultiIndex 类，它包含一个包含 2 个索引的多索引。

我尝试创建一个模板函数，该函数仅根据键的一部分进行搜索并仅修改键的一部分。

这个类有一个辅助函数

template <typename TagType,typename SearchingKey>
typename GlobalHash::index<TagType>::type::iterator GetIteratorBy(SearchingKey & key){
    return  m_pGlobalHash->get<TagType>().find(key) ;
}

并修改使用它的函数

template <typename SearchingTagType,typename ModifyingTagType,typename SearchingKey,typename ModifyKeyType> uint32_t ModifyKeyBy(SearchingKey & key,ModifyKeyType & pi_Modifykey)
    {
    uint32_t hRes = 1;

    //search for entry by TagType
    typedef  typename GlobalHash::index<SearchingTagType>::type     IndexType;
    typename IndexType::iterator it =  GetIteratorBy<SearchingTagType>(key);

    //entry found
    if( it != m_pGlobalHash->get<SearchingTagType>().end() )
    {
        //Set parameter to modify
        hRes = SetParameterKeys<ModifyingTagType>(pi_Modifykey);

        if(hRes == 1)
        {
            //get iteraror to modify
            typedef  typename GlobalHash::index<ModifyingTagType>::type     ModifyIndexType;
            typename ModifyIndexType::iterator itToModify =  m_pGlobalHash->get<ModifyingTagType>().iterator_to(*it);

            boost::function<void( ModifyKeyType &)> f = boost::bind(&CrMultiParameterMultiIndex::ModifyKey<ModifyingTagType, ModifyKeyType >, this, _1);

            //modify key failed
            if(m_pGlobalHash->modify_key(itToModify , f)==false)
                hRes = 0;
        }
    }
    //entry not found
    else
        hRes = 0;
    return hRes;
}

这次编译

uint64_t nFromImsi = 1;
uint64_t nToImsi = 1;
m_multiParam.ModifyKeyBy<IMSI_tag,IMSI_tag>( nFromImsi,nToImsi)

但不是这个

uint32_t nFromImsi = 1;
uint32_t nToImsi = 1;
m_multiParam.ModifyKeyBy<IMEI_tag,IMEI_tag>( nFromImsi,nToImsi)

为什么？以及如何编译

这里是修饰符

template <> inline void CrMultiParameterMultiIndex::ModifyKey<IMEI_tag>( uint32_t & po_Key){po_Key = m_ParameterKeys.IMEI;}
template <> inline void CrMultiParameterMultiIndex::ModifyKey<IMSI_tag>(uint64_t & po_Key){po_Key = m_ParameterKeys.IMSI;}

Answer 1

大卫，

问题

if(m_pGlobalHash->modify_key(itToModify , f)==false)

在于 m_pGlobalHash 是索引 #0 (order_by_IMSI) 的 View 并且不接受迭代器来查看 #1 (order_by_IMEI >).您可以 project iterators或选择合适的指数:

if(m_pGlobalHash->get<ModifyingTagType>().modify_key(itToModify , f)==false)