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POtemplate-id does not match any template delcaration
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  1. POtemplate-id does not match any template delcaration
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    copied!<p>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...</p> <pre><code>../../include/thread/lock_guard.inl:23: error: template-id 'lock_guard&lt;&gt;' for 'thread::lock_guard&lt;thread::null_mutex&gt;::lock_guard(thread::null_mutex&amp;)' 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&lt;&gt;' for 'thread::lock_guard&lt;thread::null_mutex&gt;::~lock_guard()' does not match any template declaration ../../include/thread/lock_guard.inl:29: error: invalid function declaration </code></pre> <p>The code is as follows:</p> <pre><code> #include "thread/mutex.hpp" namespace thread { template &lt;typename T&gt; class lock_guard { public: lock_guard(T&amp; lock); ~lock_guard(); private: mutable T&amp; m_lock; mutable int m_state; }; template &lt;&gt; class lock_guard&lt;null_mutex&gt; { public: lock_guard(null_mutex&amp;); ~lock_guard(); }; } //namespace #include "thread/lock_guard.inl" ------------------------------------ #include "thread/lock_guard.hpp" namespace thread { template &lt;typename T&gt; lock_guard&lt;T&gt;::lock_guard(T&amp; lock) : m_lock(lock), m_state(lock.lock()) { /* do nothing */ } template &lt;typename T&gt; lock_guard&lt;T&gt;::~lock_guard() { if(0 == m_state) { m_lock.unlock(); } } template &lt;&gt; lock_guard&lt;null_mutex&gt;::lock_guard(null_mutex&amp;) { /* do nothing */ } template &lt;&gt; lock_guard&lt;null_mutex&gt;::~lock_guard() { /* do nothing */ } } //namespace </code></pre>
 

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