TheEyesightDim’s gists

TheEyesightDim / inputcheck.cpp

Last active March 1, 2017 08:05

Detect invalid input and clear input stream, C++ STL

	do{
	cout<<"Input \"1\" or \"0\": ";
	cin >> scenario;

	if(cin.fail() \|\| scenario < 0 \|\| scenario > 1){
	cin.clear(); //clear failure state
	cin.ignore(std::numeric_limits<std::streamsize>::max(), '\n'); //ignore and discard failed input up to and including newline
	cout << "\nInput failed. Trying again..." << endl;
	continue;
	}

TheEyesightDim / tuples.cpp

Last active July 1, 2018 08:23

Example of working with tuples to return multiple values; Example of using tuples in place of structs

TheEyesightDim / header.h

Last active July 1, 2018 08:26

Demonstrates the use of a variadic template function within a class template.

TheEyesightDim / enum underlying type.cpp

Last active July 1, 2018 08:26

	//this function converts any member of enum of any underlying type to that type.
	//Effective Modern C++ by Scott Meyers. See item 10
	template <typename E>
	constexpr auto to_underlying(E e) noexcept
	{
	return static_cast<std::underlying_type_t<E>>(e);
	}

TheEyesightDim / point_inversion.cc

Last active July 1, 2018 03:34

Inversion of a point around another point

	//point inversion
	#include <vector>
	#include <iostream>

	struct Point { int x, y; };
	struct Line { Point petal, center; };

	//reflects Point 'mover' across another Point 'focus'.
	//'focus' is the midpoint of 'mover' and the return value.
	Point invert_point(const Point mover, const Point focus){

TheEyesightDim / ostream_itr_example.cpp

Last active July 1, 2018 00:34

Example of using ostream iterators with standard algorithms to produce interesting results.

	#include <vector>
	#include <iostream>
	#include <iterator>
	#include <algorithm>

	int main()
	{
	std::vector<int> v {7,4,1,8,5,2,9,6,3};
	std::copy(v.begin(), v.end(), std::ostream_iterator<int>(std::cout , " "));
	}

TheEyesightDim / benchmarker.php

Last active July 1, 2018 00:33

	<?php
	require 'vendor/autoload.php';
	use Symfony\Component\Stopwatch\Stopwatch;

	/**
	* @param callable $callable is a function or functor callable with parentheses.
	* @param array ...$args is the argument list which will be supplied to the $callable function.
	* @return float\|int which represents the time elapsed in the function called, in milliseconds.
	*/
	function benchmarker(Callable $callable, ...$args){

TheEyesightDim / rot_n_string.js

Last active December 17, 2018 19:01

Rotate alphabet characters in a string by an arbitrary amount

	//needed to make friendly for map function, which expects function taking dereferenced string index as argument
	function charCodeOfChar(character){
	return character.charCodeAt(0);
	}

	//String's prototype function will give weird UTF-16 literal output otherwise
	function charFromCharCode(charCode){
	return String.fromCharCode(charCode);
	}

TheEyesightDim / into_bytes.cpp

Last active September 5, 2019 12:02

Converts some type into its representation as a byte array.

	#include <algorithm>
	#include <array>

	template <typename T>
	constexpr std::array<char, sizeof(T)> into_bytes(const T& t){
	std::array<char, sizeof(T)> bytes;
	std::copy( reinterpret_cast<const char>(&t), reinterpret_cast<const char>(&t) + sizeof(t), bytes.begin() );
	return bytes;
	}

TheEyesightDim / miller_rabin.py

Created November 8, 2019 01:28

Python implementation of Miller-Rabin primality test

	def is_prime(n):
	"""A very basic implementation of the Miller-Rabin primality test."""

	#from Wikipedia: "if n < 341,550,071,728,321, it is enough to test a = 2, 3, 5, 7, 11, 13, and 17."
	small_primes = {2,3,5,7,11,13,17}
	if n in small_primes: return True
	if n < 2 or n & 1 == 0: return False

	r, d = (0, n-1)
	while (d & 1) == 0: