D, the Best Programming Language, for Former Python Developers by Victor Porton 2020

Author:Victor Porton, 2020
Language: eng
Format: epub
Published: 2020-12-31T09:37:35+00:00

Kind of templates. Eponymous templates

Almost any kind of an identifier can be a template:

enum e(int x) = x + 1; // enum template alias e(T) = T[]; // alias template void f(T)() { } // function template this(T)() { } // constructor template struct S(T) { } // struct template class S(T) { } // class template

There are no module templates and no variable templates.

There is also the keyword template specially to group several identifiers together in one template:

template GroupOfIdentifiers(T, T zero) { alias Matrix = T[3][3]; enum zeroMatrix = [ [zero, zero, zero], [zero, zero, zero], [zero, zero, zero] ]; Matrix invert(Matrix a) { return …; } } enum GroupOfIdentifiers!(double, 0.0).Matrix m = [ … ]; // … immutable inv = GroupOfIdentifiers!(double, 0.0).invert(m); // or for brevity: alias matrices = GroupOfIdentifiers!(double, 0.0); enum matrices.Matrix m2 = [ … ]; // … immutable inv2 = matrices.invert(m2);

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