模板形参给枚举成员赋值

[ksdjfalsfj]

你好！

在visual stuodio 2005 中，使用模板形参给枚举成员赋值失败，请问有什么办法解决吗？只能升级版本吗？
谢谢!

[jwj070524]

vs2010可以哦

template <int Val>
struct Type
{
    enum { value = Val };
};

int main ()
{
    Type<2> type;
}

[ri_aje]

上代码，谁知道你怎么弄的啊。

[ksdjfalsfj]

template< int SIZE >
class MemPoolT : public MemPool
{
public:
    MemPoolT() : _root(0), _currentAllocs(0), _nAllocs(0), _maxAllocs(0), _nUntracked(0)	{}
    ~MemPoolT() {
        // Delete the blocks.
        for( int i=0; i<_blockPtrs.Size(); ++i ) {
            delete _blockPtrs[i];
        }
    }

    virtual int ItemSize() const	{
        return SIZE;
    }
    int CurrentAllocs() const		{
        return _currentAllocs;
    }

    virtual void* Alloc() {
        if ( !_root ) {
            // Need a new block.
            Block* block = new Block();
            _blockPtrs.Push( block );

            for( int i=0; i<COUNT-1; ++i ) {
                block->chunk[i].next = &block->chunk[i+1];
            }
            block->chunk[COUNT-1].next = 0;
            _root = block->chunk;
        }
        void* result = _root;
        _root = _root->next;

        ++_currentAllocs;
        if ( _currentAllocs > _maxAllocs ) {
            _maxAllocs = _currentAllocs;
        }
        _nAllocs++;
        _nUntracked++;
        return result;
    }
    virtual void Free( void* mem ) {
        if ( !mem ) {
            return;
        }
        --_currentAllocs;
        Chunk* chunk = static_cast<Chunk*>( mem );
#ifdef DEBUG
        memset( chunk, 0xfe, sizeof(Chunk) );
#endif
        chunk->next = _root;
        _root = chunk;
    }
    void Trace( const char* name ) {
        printf( "Mempool %s watermark=%d [%dk] current=%d size=%d nAlloc=%d blocks=%d\n",
                name, _maxAllocs, _maxAllocs*SIZE/1024, _currentAllocs, SIZE, _nAllocs, _blockPtrs.Size() );
    }

    void SetTracked() {
        _nUntracked--;
    }

    int Untracked() const {
        return _nUntracked;
    }

	// This number is perf sensitive. 4k seems like a good tradeoff on my machine.
	// The test file is large, 170k.
	// Release:		VS2010 gcc(no opt)
	//		1k:		4000
	//		2k:		4000
	//		4k:		3900	21000
	//		16k:	5200
	//		32k:	4300
	//		64k:	4000	21000
    enum { COUNT = (4*1024)/SIZE }; // Some compilers do not accept to use COUNT in private part if COUNT is private

private:
    union Chunk {
        Chunk*  next;
        char    mem[SIZE];
    };
    struct Block {
        Chunk chunk[COUNT];
    };
    DynArray< Block*, 10 > _blockPtrs;
    Chunk* _root;

    int _currentAllocs;
    int _nAllocs;
    int _maxAllocs;
    int _nUntracked;
};

enum { COUNT = (4*1024)/SIZE }; 这个

[ksdjfalsfj]

确实没有问题，我代码里面重新定义了一个新的COUNT，导致这里编译失败。