E2321 声明未指定标签或标识符
我将代码从 VS2005 移植到 C++ Builder XE，以便它可以使用两个编译器进行编译。下面的代码在 VS2005 下编译得很好，但在 C++ Builder 下我收到了带有内联函数 rawtime(); 的主题错误消息；
（E2321 声明未指定标签或标识符）。
这是代码：
template<typename counter_type>
class synchronizer
{
private:
// PRIVATE TYPES
typedef timer<counter_type> timer_type;
typedef reference_point<counter_type> reference_point_type;
typedef time_data<counter_type> time_data;
typedef typename timer_type::time_stamp_type time_stamp_type;
typedef typename timer_type::time_span_type time_span_type;
typedef typename filetime_counter::value_type time_type;
typedef typename counter_type::value_type counter_value_type;
typedef synchronizer<counter_type> this_type;
/* some code removed for sake of this post */
public:
typedef counter_type counter_type;
typedef typename counter_type::value_type raw_value_type;
TIMESTATS_STMT(typedef statistics<counter_type> statistics_type);
inline raw_value_type rawtime() const /* Subject ERROR coming from this line */
{
return m_timer.now().value();
}
我尝试按照这篇文章的结果解决该特定问题，但没有解决这个问题。 模板类运算符重载问题
想法/通讯？
--- 编辑：
反馈表明 TIMESTATS_STMT 是错误的实际原因，因此以下是其定义方式。请注意，TIME_ENABLE_STATISTICS 在 VS2005 和 C++ Builder XE 中均被注释掉。
// #define TIME_ENABLE_STATISTICS
//
//
// Make null definitions
//
#define TIMESTATS_VAR(var, type, initial)
#define TIMESTATS_STMT(stmt)
#ifdef TIME_ENABLE_STATISTICS
//
// Make real definitions
//
#undef TIMESTATS_VAR
#define TIMESTATS_VAR(var, type, initial) type var = initial
#undef TIMESTATS_STMT
#define TIMESTATS_STMT(stmt) stmt
--- 编辑
有问题的行确实似乎是 TIMESTATS_STMT 行。我可以通过取消定义 NULL #define 来纠正，如下所示。
#ifdef TIME_ENABLE_STATISTICS
TIMESTATS_STMT(typedef statistics<counter_type> statistics_type);
#endif
I'm porting code from VS2005 to C++ Builder XE so that it will compile with both compilers. The following code compiles fine under VS2005 but under C++ Builder I get the subject error message with the inline function rawtime();
(E2321 Declaration does not specify a tag or an identifier).
Here is the code:
template<typename counter_type>
class synchronizer
{
private:
// PRIVATE TYPES
typedef timer<counter_type> timer_type;
typedef reference_point<counter_type> reference_point_type;
typedef time_data<counter_type> time_data;
typedef typename timer_type::time_stamp_type time_stamp_type;
typedef typename timer_type::time_span_type time_span_type;
typedef typename filetime_counter::value_type time_type;
typedef typename counter_type::value_type counter_value_type;
typedef synchronizer<counter_type> this_type;
/* some code removed for sake of this post */
public:
typedef counter_type counter_type;
typedef typename counter_type::value_type raw_value_type;
TIMESTATS_STMT(typedef statistics<counter_type> statistics_type);
inline raw_value_type rawtime() const /* Subject ERROR coming from this line */
{
return m_timer.now().value();
}
I tried following the results from this post which solved that particular problem but not this one.
template class operator overloading problem
Thoughts/Commnets?
--- EDIT:
Feedback suggesting the TIMESTATS_STMT is acutal cause of the error so here is how that is defined. Note that TIME_ENABLE_STATISTICS is commented out in both VS2005 and C++ Builder XE.
// #define TIME_ENABLE_STATISTICS
//
//
// Make null definitions
//
#define TIMESTATS_VAR(var, type, initial)
#define TIMESTATS_STMT(stmt)
#ifdef TIME_ENABLE_STATISTICS
//
// Make real definitions
//
#undef TIMESTATS_VAR
#define TIMESTATS_VAR(var, type, initial) type var = initial
#undef TIMESTATS_STMT
#define TIMESTATS_STMT(stmt) stmt
--- EDIT
offending line does appear to be the TIMESTATS_STMT line. I was able to correct by undefining NULL #define as follows.
#ifdef TIME_ENABLE_STATISTICS
TIMESTATS_STMT(typedef statistics<counter_type> statistics_type);
#endif
如果你对这篇内容有疑问，欢迎到本站社区发帖提问 参与讨论，获取更多帮助，或者扫码二维码加入 Web 技术交流群。
绑定邮箱获取回复消息
由于您还没有绑定你的真实邮箱，如果其他用户或者作者回复了您的评论，将不能在第一时间通知您！
发布评论
评论（2）
错误：
TIMESTATS_STMT(typedef statsstatistics_type); 正确：
TIMESTATS_STMT(typedef statsstatistics_type) 删除宏后面的分号。宏是一种强大的语言扩展，但有时非常非常危险且不可预测。
我喜欢使用 C++ 宏，但它们很邪恶。
Wrong:
TIMESTATS_STMT(typedef statistics<counter_type> statistics_type);Correct:
TIMESTATS_STMT(typedef statistics<counter_type> statistics_type)Remove the semicolon after the macro. The macro is a powerful language extension, but sometimes very-very dangerous and unpredictable.
I like to use C++ macros, but they are evil.
在不知道 TIMESTATS_STMT 扩展为什么的情况下很难说，但我敢打赌问题实际上发生在宏扩展行上，并且被标记到下一行，这对我来说似乎很好。
Without knowing what
TIMESTATS_STMTexpands to it's hard to say, but I bet the problem actually occurs on the line of the macro expansion and is being tagged to the following line, which appears fine to me.