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TemplateHelpers.hh
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TemplateHelpers.hh
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////////////////////////////////////////////////////////////////////////////////
// TemplateHelpers.hh
////////////////////////////////////////////////////////////////////////////////
/*! @file
// Various convenience templates/metafunctions.
*/
// Author: Julian Panetta (jpanetta), julian.panetta@gmail.com
// Created: 02/06/2022 11:56:35
////////////////////////////////////////////////////////////////////////////////
#ifndef TEMPLATEHELPERS_HH
#define TEMPLATEHELPERS_HH
#include <cstdlib>
#include <utility>
#include <stdexcept>
namespace detail {
template<template<size_t...> class T, size_t N, size_t Deg, size_t... Degrees>
struct DegreeReplicatorImpl {
using type = typename DegreeReplicatorImpl<T, N - 1, Deg, Degrees..., 1>::type;
};
template<template<size_t...> class T, size_t Deg, size_t... Degrees>
struct DegreeReplicatorImpl<T, 1, Deg, Degrees...> {
using type = T<Deg, Degrees...>;
};
}
// Convert a template with parameters `size_t... Degrees` into one with
// a parameters `size_t N` (that gets expanded into `N` copies of `Deg`)
template<template<size_t...> class T, size_t Deg = 1>
struct DegreeReplicator {
template<size_t N>
using type = typename detail::DegreeReplicatorImpl<T, N, Deg>::type;
};
// Some operations can be implemented more easily and efficiently when the
// grid dimension is known as a template parameter:
// template<size_t N>
// struct Impl {
// static void run(...) {
// // Dimension-specific implementation here.
// }
// };
// this function chooses the appropriate instantiation of such an
// implementation template based on the runtime dimension.
template<template<size_t /* N */> class F, typename... Args>
void dispatchDimSpecific(size_t N, Args&&... args) {
if (N == 1) F<1>::run(std::forward<Args>(args)...);
else if (N == 2) F<2>::run(std::forward<Args>(args)...);
else if (N == 3) F<3>::run(std::forward<Args>(args)...);
else throw std::runtime_error("Unsupported dimension");
}
#endif /* end of include guard: TEMPLATEHELPERS_HH */