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POTemplate partial specialization with multiple template argument error
 

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  1. POTemplate partial specialization with multiple template argument error
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    <p>When I use template partial specialization on a class with one template argument, I can specialize a method like this:</p> <pre><code>#include &lt;cstdlib&gt; template&lt; std::size_t Dim &gt; class Test { public: int foo(); }; template&lt; std::size_t Dim &gt; inline int Test&lt; Dim &gt;::foo() { return 0; } template&lt;&gt; inline int Test&lt; 1 &gt;::foo() { return 1; } int main() { Test&lt; 2 &gt; wTest2; Test&lt; 1 &gt; wTest1; wTest2.foo(); wTest1.foo(); return 0; } </code></pre> <p>The method foo is specialized for Dim = 1. But as soon as I add a template argument to my class, like this:</p> <pre><code>#include &lt;cstdlib&gt; template&lt; typename T, std::size_t Dim &gt; class Test { public: int foo(); }; template&lt; typename T, std::size_t Dim &gt; inline int Test&lt; T, Dim &gt;::foo() { return 0; } template&lt; typename T &gt; inline int Test&lt; T, 1 &gt;::foo() { return 1; } int main() { Test&lt; double, 2 &gt; wTest2; Test&lt; double, 1 &gt; wTest1; wTest2.foo(); wTest1.foo(); return 0; } </code></pre> <p>The compiler (of VS2010) complains with these errors:</p> <pre><code>1&gt;c:\documents and settings\cayouette\my documents\codelocal\testtemplatespecialization\main.cpp(20): error C3860: template argument list following class template name must list parameters in the order used in template parameter list 1&gt;c:\documents and settings\cayouette\my documents\codelocal\testtemplatespecialization\main.cpp(20): error C2995: 'int Test&lt;T,Dim&gt;::foo(void)' : function template has already been defined 1&gt; c:\documents and settings\cayouette\my documents\codelocal\testtemplatespecialization\main.cpp(7) : see declaration of 'Test&lt;T,Dim&gt;::foo' 1&gt;c:\documents and settings\cayouette\my documents\codelocal\testtemplatespecialization\main.cpp(20): error C2976: 'Test&lt;T,Dim&gt;' : too few template arguments 1&gt;c:\documents and settings\cayouette\my documents\codelocal\testtemplatespecialization\main.cpp(26): error C2264: 'Test&lt;T,Dim&gt;::foo' : error in function definition or declaration; function not called 1&gt; with 1&gt; [ 1&gt; T=double, 1&gt; Dim=2 1&gt; ] 1&gt;c:\documents and settings\cayouette\my documents\codelocal\testtemplatespecialization\main.cpp(27): error C2264: 'Test&lt;T,Dim&gt;::foo' : error in function definition or declaration; function not called 1&gt; with 1&gt; [ 1&gt; T=double, 1&gt; Dim=1 1&gt; ] 1&gt; 1&gt;Build FAILED. </code></pre> <p>The way I see this, there is no ambiguity and the compiler should be able to resolve everything and work just like the one argument case.</p> <p>If this is not supported in C++, please explain why.</p>
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    1. USPhilippe Cayouette
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    1. COdupe of this FAQ question: http://stackoverflow.com/questions/1501357/template-specialization-of-particular-members
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      1. POTemplate partial specialization with multiple template argument error
      1. USJohannes Schaub - litb
    2. COThanks Johannes, I did look for hours for that kind of answer without success. That being said, my question is a bit different, I am asking for the reason why it does not work, and so far, I do not have a definite answer.
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