C++实现内存池

人家对内存块的管理是用vector,动态的插入与删除，来做内存的分配与回收，基于人家的代码，做的一些改动，用Map进行管理，用标志来区分该内存块是否已分配，回收时，内存里面的内容也得重置掉，以免影响下一次的调用。

代码如下

  std
在内存池中分配固定大小的内存块
该类的目的是加速内存分配速度，并且减少因重复分配相同
内存时产生的内存碎片，比如在服务器应用程序中。
       isHasUse 
         iIndx    
       pBlock   
    stdsize_t blockSize  preAlloc  
      ptr
    stdsize_t  
     CMemPool
    CMemPool    CMemPool
        BLOCK_RESERVE  
     stdvector BlockVec
    stdsize_t m_blockSize
             m_maxAlloc
             m_allocated
    BlockVec    m_blocks
     map sBlock BlockMap
    BlockMap    m_blocks_map
 stdsize_t  
     m_blockSize
     iTotalUseNum  
      it  m_blocks_map it  m_blocks_map it
         itsecondisHasUse  
            iTotalUseNum  
     iTotalUseNum
     iAvailableNum  
      it  m_blocks_map it  m_blocks_map it
         itsecondisHasUse  
            iAvailableNum  
     iAvailableNum
     m_blocks_map
stdsize_t blockSize  preAlloc 
blockSize
preAlloc
    m_blocks_map
      i   i  preAlloc i
        sBlock nBlock
        nBlockisHasUse  
        nBlockiIndx  i
        nBlockpBlock   m_blockSize
        m_blocks_mapi  nBlock
     BlockMapiterator it  m_blocks_map it  m_blocks_map it
        cout    itsecondiIndx    endl
         itsecondpBlock 
    m_blocks_map
      it  m_blocks_map it  m_blocks_map it
         itsecondisHasUse  
            itsecondisHasUse   
            cout    itsecondiIndx    endl
             itsecondpBlock
     iter  m_blocks_map
    iter 
     maxIndx  itersecondiIndx
     curIndx  maxIndx  
    sBlock nBlock
    nBlockiIndx  curIndx
    nBlockisHasUse  
    nBlockpBlock   m_blockSize
    m_blocks_mapcurIndx  nBlock
    m_blocks_mapcurIndxisHasUse  
    cout    m_blocks_mapcurIndxiIndx    endl
     m_blocks_mapcurIndxpBlock
  ptr
      it  m_blocks_map it  m_blocks_map it
          pTmp  ptr
         itsecondpBlock  pTmp
            cout    itsecondiIndx    endl
            itsecondisHasUse  
            pTmp  m_blockSize

测试代码

     m_id
     m_num
     m_id
     m_num
     m_str
    CMemPool DATA_BLOCK_LEN 
    cout    myPool1  endl
    cout    myPool1  endl
    cout    myPool1  endl
    cout    myPool1  endl endl
      pTest
    pTest   myPool1
    pTestm_id  
    pTestm_num  
    cout  pTestm_id  pTestm_num  endl
      pTest2
    pTest2   myPool1
    pTest2m_id  
    pTest2m_num  
    cout  pTest2m_id    pTest2m_num  endl  endl
    cout    myPool1  endl
    cout    myPool1  endl  endl
    myPool1pTest
    pTest  
    cout    myPool1  endl
    cout    myPool1  endl  endl
      pTtmp
    pTtmp   myPool1
    pTtmpm_id  
      cTmp 
    pTtmpm_str cTmp cTmp
    cout  pTtmpm_str  endl
    cout    myPool1  endl
    cout    myPool1  endl  endl
    myPool1pTtmp
      i   i   i
          pTest3
        pTest3   myPool1
        pTest3m_id  
        pTest3m_num  
        cout  pTest3m_id    pTest3m_num  endl  endl
        cout    myPool1  endl
        cout    myPool1  endl
        cout    myPool1  endl  endl
     iWait
    cin  iWait