模板 ID 不匹配任何模板声明 [英] template-id does not match any template delcaration
本文介绍了模板 ID 不匹配任何模板声明的处理方法,对大家解决问题具有一定的参考价值,需要的朋友们下面随着小编来一起学习吧!
问题描述
我遇到了一个令人沮丧的编译器错误,我似乎无法解决.这与模板专业化有关,但我看不出有什么问题...
I'm getting a frustrating compiler error I can't seem to work around. It's to do with the template specialization but I can't see what's wrong...
../../include/thread/lock_guard.inl:23: error: template-id 'lock_guard<>' for 'thread::lock_guard<thread::null_mutex>::lock_guard(thread::null_mutex&)' does not match any template declaration
../../include/thread/lock_guard.inl:23: error: invalid function declaration
../../include/thread/lock_guard.inl:29: error: template-id 'lock_guard<>' for 'thread::lock_guard<thread::null_mutex>::~lock_guard()' does not match any template declaration
../../include/thread/lock_guard.inl:29: error: invalid function declaration
代码如下:
#include "thread/mutex.hpp"
namespace thread {
template <typename T>
class lock_guard
{
public:
lock_guard(T& lock);
~lock_guard();
private:
mutable T& m_lock;
mutable int m_state;
};
template <>
class lock_guard<null_mutex>
{
public:
lock_guard(null_mutex&);
~lock_guard();
};
} //namespace
#include "thread/lock_guard.inl"
------------------------------------
#include "thread/lock_guard.hpp"
namespace thread {
template <typename T>
lock_guard<T>::lock_guard(T& lock)
: m_lock(lock),
m_state(lock.lock())
{
/* do nothing */
}
template <typename T>
lock_guard<T>::~lock_guard()
{
if(0 == m_state)
{
m_lock.unlock();
}
}
template <>
lock_guard<null_mutex>::lock_guard(null_mutex&)
{
/* do nothing */
}
template <>
lock_guard<null_mutex>::~lock_guard()
{
/* do nothing */
}
} //namespace
推荐答案
一个完整的类模板特化不再是一个模板,它是一个普通的类.因此,您在定义其成员时不需要模板<>:
A full class template specialization is not a template any more, it is a regular class. Hence you don't need template<> when defining its members:
lock_guard<null_mutex>::lock_guard(null_mutex&)
{
/* do nothing */
}
lock_guard<null_mutex>::~lock_guard()
{
/* do nothing */
}
这篇关于模板 ID 不匹配任何模板声明的文章就介绍到这了,希望我们推荐的答案对大家有所帮助,也希望大家多多支持IT屋!
查看全文