Registration::Registrar< Registrant, Args > Struct Template Reference

A template for defining a registrar. More...

#include <Registration.hpp>

Public Types
template<typename RegistrarList >
using	f = Registrant< Args..., RegistrarList >

Detailed Description

template<template< typename... > class Registrant, typename... Args>
struct Registration::Registrar< Registrant, Args >

A template for defining a registrar.

A registrar for a class can be defined by making a type alias to this struct, filling in the registrant.

template <typename SomeArg, typename Registrars>
class Derived2;
 
namespace Registrars {
template <typename SomeArg>
using Derived2 = Registration::Registrar<::Derived2, SomeArg>;
}  // namespace Registrars
 
template <typename SomeArg,
          typename Registrars = tmpl::list<Registrars::Derived2<SomeArg>>>
class Derived2 : public Base<Registrars> {
 public:
  static constexpr Options::String help = "help";
  using options = tmpl::list<>;
  int func() const override { return 2; }
};

In more complex cases (such as with non-type template parameters) defining a registrar manually may be necessary.

template <int N, typename Registrars>
class Derived3;
 
namespace Registrars {
template <int N>
struct Derived3 {
  template <typename RegistrarList>
  using f = ::Derived3<N, RegistrarList>;
};
}  // namespace Registrars
 
template <int N, typename Registrars = tmpl::list<Registrars::Derived3<N>>>
class Derived3 : public Base<Registrars> {
 public:
  static constexpr Options::String help = "help";
  using options = tmpl::list<>;
  int func() const override { return N; }
};

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The documentation for this struct was generated from the following file:

• src/Utilities/Registration.hpp