Re: accessing numeric template parameters
On Monday, 3 November 2014 at 21:17:09 UTC, Philippe Sigaud via Digitalmars-d-learn wrote: struct polynomial(uint base) { private: uint[] N; public: this(uint x) { base = x; } base is part of the type. polynomial is just a 'recipe' for a type, the real struct would be Polynomial!(0), Polynomial!(1), etc. Note that Polynomial!0, Polynomial!1, ... are all different types. Yes, that's what I intend. Being part of the type means it's defined only at compile-time, you cannot use a runtime value (like 'x') to initialize it. Note that with your current code, `base' is not visible outside Polynomial. You can alias it to a field to make it visible: struct Polynomial(uint base) { alias b = base; // b is visible outside (but set at Ah, ok. Thank you! compile-time !) ... } You can create one like this: Polynomial!2 poly; poly.N = [0,1,0,0,1,1]; Ok, now I remember, struct doesn't need an explicit constructor. (in this case)
Re: accessing numeric template parameters
On Mon, Nov 3, 2014 at 3:27 PM, Dominikus Dittes Scherkl via Digitalmars-d-learn wrote: > If I have a struct with numeric template parameter, how can I access it > within member functions? Like normal member variables? And how about the > constructor? > > struct polynomial(uint base) > { > private: >uint[] N; > public: >this(uint x) { base = x; } base is part of the type. polynomial is just a 'recipe' for a type, the real struct would be Polynomial!(0), Polynomial!(1), etc. Note that Polynomial!0, Polynomial!1, ... are all different types. Being part of the type means it's defined only at compile-time, you cannot use a runtime value (like 'x') to initialize it. Note that with your current code, `base' is not visible outside Polynomial. You can alias it to a field to make it visible: struct Polynomial(uint base) { alias b = base; // b is visible outside (but set at compile-time !) ... } You can create one like this: Polynomial!2 poly; poly.N = [0,1,0,0,1,1]; assert(poly.b == 2); Of course, you cannot change b: `poly.b = 3;' is forbidden.
Re: accessing numeric template parameters
On Monday, 3 November 2014 at 14:27:47 UTC, Dominikus Dittes Scherkl wrote: If I have a struct with numeric template parameter, how can I access it within member functions? Like normal member variables? And how about the constructor? struct polynomial(uint base) { private: uint[] N; public: this(uint x) { base = x; } ... void add(Polynomial!base P) { if(N.length < P.N.length) N.length = P.N.length; foreach(i; 0..P.N.length) { N[i] = (N[i]+P.N[i]) % base; } } } This doesn't work for me :-/ You cannot assign to it, because it is only avaliable during compilation. Think of it as an immediate value, not variable.
accessing numeric template parameters
If I have a struct with numeric template parameter, how can I access it within member functions? Like normal member variables? And how about the constructor? struct polynomial(uint base) { private: uint[] N; public: this(uint x) { base = x; } ... void add(Polynomial!base P) { if(N.length < P.N.length) N.length = P.N.length; foreach(i; 0..P.N.length) { N[i] = (N[i]+P.N[i]) % base; } } } This doesn't work for me :-/