gatchamix’s gists

gatchamix / spiral_generator.cpp

Last active March 12, 2020 15:49

scalable cache friendly spiral sequence generation (SNSystems)

	#include <cstddef>
	#include <algorithm>
	#include <array>
	#include <iostream>

	using std::size_t;

	auto constexpr calculate(size_t row, size_t column, size_t width, size_t height, size_t value = 0)
	{
	--width;

gatchamix / signature_detection.cpp

Last active August 18, 2017 09:40

member function exact signature matching

	#include <type_traits>
	#include <functional>

	//

	struct validator
	{
	template <template <class...> class, class...>
	static auto constexpr is_valid(...)
	-> std::false_type;

gatchamix / jump_list.cpp

Last active August 28, 2017 23:18

hard jump-list generator

	#include <array>
	#include <type_traits>
	#include <utility>

	//

	template <auto... Vs>
	struct auto_t
	{ static auto constexpr size = sizeof...(Vs); };

gatchamix / constexpr_map.cpp

Last active May 12, 2021 14:52

constexpr map

gatchamix / constexpr_switch.cpp

Last active October 11, 2021 10:58

constexpr switch/case/default

gatchamix / template_list.cpp

Last active August 27, 2017 16:59

template type and non-type list and manipulation functions (type_t/auto_t)

	#include <type_traits>
	#include <limits>
	#include <utility>

	//

	template <class... Ts>
	struct type_t
	{ static auto constexpr size = sizeof...(Ts); };

gatchamix / meta17.cpp

Last active August 31, 2017 21:21

meta-programming types and algorithms using C++17/2a

gatchamix / tuple17.cpp

Last active July 24, 2018 13:35

simple tuple container using C++17

	template <std::size_t N, class T>
	struct tuple_elem
	{
	constexpr tuple_elem(T&& val)
	: val_{ std::forward<T>(val) }
	{}

	template <auto I, std::enable_if_t<I == N>* = nullptr>
	auto constexpr& operator[](constant<I>)
	{ return val_; }

gatchamix / static_class_2a.cpp

Created September 7, 2017 16:07

improvement to static class design using hana::is_valid + C++2a explicit lambda templates

	#include <utility>

	//

	template <class F, class... Args,
	class = decltype(std::declval<F&&>()(std::declval<Args&&>()...))>
	auto constexpr is_valid_impl(int)
	{ return true; }

	template <class F, class... Args>

gatchamix / to_list.cpp

Created October 13, 2017 13:57

helper macro to convert applicable data into an auto_list equivalent