johnmcfarlane / godbolt_average.cpp

Last active May 24, 2017 00:46

example of zero-cost abstraction using the fixed_point library

	// Signed 15:16 Fixed-Point Square Function Using sg14::elastic

	// Here's how to use the fixed_point library on Godbolt.org.
	// Normally, you'd just add `#include <sg14/fixed_point>`.
	#define SG14_GODBOLT_ORG
	#include <https://raw.githubusercontent.com/johnmcfarlane/fixed_point/develop/include/sg14/bits/config.h>
	#include <https://raw.githubusercontent.com/johnmcfarlane/fixed_point/develop/include/sg14/bits/config.h>
	#include <https://raw.githubusercontent.com/johnmcfarlane/fixed_point/develop/include/sg14/cstdint>
	#include <https://raw.githubusercontent.com/johnmcfarlane/fixed_point/develop/include/sg14/limits>
	#include <https://raw.githubusercontent.com/johnmcfarlane/fixed_point/develop/include/sg14/type_traits>

johnmcfarlane / stats.hpp

Created January 6, 2017 21:04

most basic statistics gatherer

	#include <algorithm>
	#include <limits>

	template<typename Number = int, typename Counter = int>
	class stats {
	public:
	void sample(Number const & n) {
	_sum += n;
	_count ++;
	_minimum = std::min(_minimum, n);

johnmcfarlane / value_type.hpp

Created December 12, 2016 07:41

possible implementation of proposed standard library additions, std::value_type and std::value_type_t

johnmcfarlane / godbold_square.cpp

Last active June 24, 2017 09:30

example of zero-cost abstraction using the fixed_point library

	// Signed 15:16 Fixed-Point Square Function Using sg14::elastic

	#include <https://gist.githubusercontent.com/johnmcfarlane/23b8bc5fefb77d482306c5bc837b5df1/raw/ed6cdfc3de42ae3c140bbbdd0ce5b8bc131d1f02/fixed_point.h>

	using namespace sg14;

	// square a nunber using 15:16 fixed-point arithmetic
	// without using a fixed-point library
	float square_int(float input) {
	// user must scale values by the correct amount

johnmcfarlane / elastic

Last active November 15, 2016 04:11

single-header version of header, elastic.h, from johnmcfarlane/fixed_point


	// Copyright John McFarlane 2015 - 2016.
	// Distributed under the Boost Software License, Version 1.0.
	// (See accompanying file ../LICENSE_1_0.txt or copy at
	// http://www.boost.org/LICENSE_1_0.txt)

	/// \file
	/// \brief essential definitions related to the `sg14::elastic` type

	#define SG14_USE_INT128

johnmcfarlane / iso_4217.cpp

Created November 11, 2016 08:31

ISO 4217 vs ISO C++

	namespace iso_4217 {
	struct code {
	const char* entity;
	const char* currency;
	const char* alpha;
	int numeric;
	int minor_unit;
	};

	constexpr const char* currency_na = nullptr;

johnmcfarlane / seconds since function first called

Created August 23, 2016 18:16

	static auto start = std::chrono::system_clock::now();
	auto t = std::chrono::duration_cast<std::chrono::duration<double>>(std::chrono::system_clock::now() - start).count();

johnmcfarlane / fixed_point.md

Created July 9, 2016 20:44

Header file `fixed_point.h`

#define SG14_FIXED_POINT_H 1

#include "type_traits.h"

#include "bits/common.h"

#define SG14_FIXED_POINT_EXCEPTIONS_ENABLED

johnmcfarlane / fixed_point.md

Created July 9, 2016 20:41

Result of running fixed_point.h through standardese

Header file fixed_point.h

#define SG14_FIXED_POINT_H 1

#include "type_traits.h"

#include "bits/common.h"

#define SG14_FIXED_POINT_EXCEPTIONS_ENABLED

johnmcfarlane / functor.c

Last active May 3, 2020 17:08

Illustrates run-time polymorphism in C

	// functor.c : Illustrates run-time polymorphism in C.
	//

	#include <memory.h>
	#include <stdio.h>
	#include <stdlib.h>

	////////////////////////////////////////////////////////////////////////////////
	// APIs

John McFarlane johnmcfarlane