Sorry. My problem more complex and my simplification is not
correct.
I want use mixin for math operations.
mixin template vectOp( string DataName, int DataLen, T, vecType )
{
mixin( "alias " ~ DataName ~ " this;" );
....
auto opBinary(string op,E)( E[DataLen] b ) ....
auto opBinary(string op,E)( E[] b ) ....
auto opOpBinary(string op,E)( E[] b ) ....
auto opOpBinary(string op,E)( E[DataLen] b ) ....
....
}
struct vec(string S,T=double)
{
T[S.length] data;
mixin vectOp( "data", S.length, T, vec!(S,T) );
}
unittest{
vec!"xyz" a;
vec!"xyz" b;
a += b;
}
and it isn't work
Error: 'a += b' is not a scalar, it is a vec!("xyz")
Error: 'a._data' is not of arithmetic type, it is a double[3LU]
Error: 'b._data' is not of arithmetic type, it is a double[3LU]
