import std.conv : to;
struct Matrix(T, size_t r, size_t c){
public:
T[r*c] _data;
Matrix opBinary(string op)(T scalar) if(op == "*"){
string construct(){
string result = "[";
for(size_t i = 0; i < r * c; i++)
result ~= "_data["~to!string(i)~"] * scalar, ";
return result ~= "]";
}
return Matrix(mixin(construct()));
}
Matrix opBinary(string op)(ref const(Matrix) m)
const if(op == "+" || op == "-"){
string construct(){
string result = "[";
for(size_t i = 0; i < r * c; i++)
result ~= "_data["~to!string(i)~"]"~op~"m._data["~to!string(i)~"], ";
return result ~= "]";
}
return Matrix(mixin(construct()));
}
}
struct A(T){
public:
Matrix!(T, 3, 1) _a;
alias _a this;
this(T a, T b, T c){
this._data[0] = a;
this._data[1] = b;
this._data[2] = c;
}
}
void main(){
auto a = A!double(3, 3, 3);
auto r1 = a * 3.0; // ok
auto r2 = a + a; // ok
auto r3 = a + (a * 3.0); // Error: incompatible types for ((a) +
(a._a.opBinary(3.0e+0))): 'A!(double)' and 'Matrix!(double,3,1)'
}
Why does the last expression fail? and how do I fix it?
