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POC++ template operator+ how to make diffrent instances work with it
 

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    <p>First I have Matrix template Matrix&lt; typename T, int Roz> and specialization of this template Matrix. But the specialization is create with constructor where argument is a size of matrix. So in example code A and Z have the same dimension. So I want to make add operator work with it. But complier say: error: no match for 'operator+' in 'Z + A'. So how I need to write operator+ for Matrix wich will be work with Matrix? </p> <p>Code of Matrix templates below:</p> <pre><code>template&lt;typename T,int Roz&gt; class Matrix { public: T tab[Roz][Roz]; int z=Roz; Matrix() { for(int i=0;i&lt;Roz;++i) for(int j=0;j&lt;Roz;++j) tab[i][j]=0; } T&amp; operator()(int x,int y){ return tab[x-1][y-1]; } //Problematic operator Matrix&amp; operator+(Matrix&lt;T,Roz&gt; b) { Matrix&lt;T,Roz&gt; tmp; for(int i=0;i&lt;Roz;++i) for(int j=0;j&lt;Roz;++j) tmp.tab[i][j]=this-&gt;tab[i][j]+b.tab[i][j]; } friend ostream&amp; operator&lt;&lt;(ostream&amp; out, Matrix&lt;T,Roz&gt; &amp;v) { for(int i=0;i&lt;v.z;++i) { for(int j=0;j&lt;v.z;++j) out&lt;&lt;v.tab[i][j]&lt;&lt;" "; out&lt;&lt;endl; } return out; } }; //Specialization template template&lt;class T&gt; class Matrix&lt;T,0&gt; { private: Matrix() { } public: vector&lt;vector&lt;T&gt; &gt; tab; int z=0; Matrix(int z) { for(int i=0;i&lt;z;++i) tab.push_back(vector&lt;T&gt;(z)); this-&gt;z = z; for(int i=0;i&lt;z;++i) for(int j=0;j&lt;z;++j) tab[i][j]=0; } T&amp; operator()(int x,int y){ return tab[x-1][y-1]; } //Problematic operator Matrix&amp; operator+(Matrix&lt;T,0&gt; b) { Matrix&lt;T,0&gt; tmp(b.z); for(int i=0;i&lt;z;++i) for(int j=0;j&lt;z;++j) tmp.tab[i][j]=this-&gt;tab[i][j]+b.tab[i][j]; } //Problematic operator Matrix&amp; operator+(Matrix&lt;T,0&gt; &amp;b) { Matrix&lt;T,0&gt; tmp(b.z); for(int i=0;i&lt;z;++i) for(int j=0;j&lt;z;++j) tmp.tab[i][j]=this-&gt;tab[i][j]+b.tab[i][j]; } friend ostream&amp; operator&lt;&lt;(ostream&amp; out, Matrix&lt;T,0&gt; &amp;v) { for(int i=0;i&lt;v.z;++i) { for(int j=0;j&lt;v.z;++j) out&lt;&lt;v.tab[i][j]&lt;&lt;" "; out&lt;&lt;endl; } return out; } }; </code></pre> <p>When I try add for example Matrix &lt; int,3 > and Matrix &lt; int, 0 > this make error. How I must definie operator+ in both templates they will work together?May I have to overload operator+ in specialization template? </p> <p>The code below makes error when I try add A + Z.</p> <pre><code>int main() { Matrix&lt;int,3&gt; A, B; Matrix&lt;int, 4&gt; C; Matrix&lt;int, 0&gt; Z(3); A(1,1)=1; B(1,1)=2; Z(1,1)=1; Z + A;//&lt;------- here error between diffrent instance of Matrix template } </code></pre>
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