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POTemplate constructor in a class template - how to explicitly specify template argument for the 2nd parameter?
 

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    <p>Template constructor in a class template - how to explicitly specify template argument for the 2nd parameter?</p> <p>compile error when tried to explicit specify template argument for constructor 2. How should I do it if I really want to explicit call constructor 2 ?</p> <p>Please note this is the same situation for boost::shared_ptr when you want to explicitly specify the deleter type. </p> <p>N.B. For <strong>non</strong>-construction function foo(), explicitly specify works fine.</p> <p>N.B I know it works fine <strong>without</strong> specify the 2nd one explicitly for the constructor 2 as template argument deduction normally just works fine, I am just curious how to specify it explicitly.</p> <pre><code>template&lt;class T&gt; class TestTemplate { public: //constructor 1 template&lt;class Y&gt; TestTemplate(T * p) { cout &lt;&lt; "c1" &lt;&lt; endl; } //constructor 2 template&lt;class Y, class D&gt; TestTemplate(Y * p, D d) { cout &lt;&lt; "c2" &lt;&lt; endl; } template&lt;class T, class B&gt; void foo(T a, B b) { cout &lt;&lt; "foo" &lt;&lt; endl; } }; int main() { TestTemplate&lt;int&gt; tp(new int());//this one works ok call constructor 1 //explicit template argument works ok tp.foo&lt;int*, string&gt;(new int(), "hello"); TestTemplate&lt;int&gt; tp2(new int(),2);//this one works ok call constructor 2 //compile error when tried to explicit specify template argument for constructor 2 //How should I do it if I really want to explicit call constructor 2? //TestTemplate&lt;int*, int&gt; tp3(new int(), 2); //wrong //TestTemplate&lt;int*&gt; tp3&lt;int*,int&gt;(new int(), 2); //wrong again return 0; } </code></pre>
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    1. CO`tempate<class T> TestTemplate(T * p)` results in an error (gcc 4.6.3): "error: shadows template parm 'class T'". Same with `void foo()`. When I replace `T` with e.g. `X`, I can make it work.
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      1. USOlaf Dietsche
    2. COWhich compiler are you using? I can't even compile your code
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      1. USgogoprog
    3. CO@gogoprog You're not the only one.
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      1. USWhozCraig
 

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