A simple file that creates a repeat loop which simply repeats the provided code the specified number of times!

repeat.hpp

/*
	This is free and unencumbered software released into the public domain.

	Anyone is free to copy, modify, publish, use, compile, sell, or distribute
	this software, either in source code form or as a compiled binary, for any
	purpose, commercial or non-commercial, and by any means.

	In jurisdictions that recognize copyright laws, the author or authors of
	this software dedicate any and all copyright interest in the software to
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	at large and to the detriment of our heirs and successors. We intend this
	dedication to be an overt act of relinquishment in perpetuity of all present
	and future rights to this software under copyright law.

	THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
	OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
	FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
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	IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
	CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.

	For more information, please refer to <http://unlicense.org/>
*/

/* -----------------------------------------------------------------------------
	SYNTAX EXAMPLE
----------------------------------------------------------------------------- */
/*
	repeat(x){
		// code here
	}

	Will repeat the provided code x times. (A counter "_i" storing the iteration
	index (which counts down by default) will always be present)

	Ex:
	repeat(5)
		std::cout << "This line will be repeated 5 times" << std::endl;
*/

/*
	repeat(x, index){
		// code here
	}

	Will repeat the provided code x times, storing the current index in a
	variable with the name of the second input.

	Ex:
	repeat(5, index)
		std::cout << "Current index: " << index << std::endl;
*/

/*
	repeat(x, type, index){
		// code here
	}

	Will repeat the provided code x times, storing the current index in a
	variable with type dictated by the second input and a name provided by the third

	This option shouldn't be necessary for 99% of applications.
*/

/*
	rrepeat(x){
		// code here
	}

	rrepeat(x, index){
		// code here
	}

	rrepeat(x, type, index){
		// code here
	}

	Along with reverse_repeat, reverseRepeat, and ReverseRepeat variations all
	work the same as their repeat counterparts except they will always count
	from x - 1 to 0.

	By default repeat loops are reverse repeat loops
*/

/*
	frepeat(x){
		// code here
	}

	frepeat(x, index){
		// code here
	}

	frepeat(x, type, index){
		// code here
	}

	Along with forward_repeat, forwardRepeat, and ForwardRepeat variations all
	work the same as their repeat counterparts except they will always count
	from 0 to x - 1.

	If you wish for the default repeat loop to be a reverse repeat loop you may
	define:
	  #define REPEAT_FORWARD_DEFAULT
	before including this file.
*/

#ifndef _REPEAT_H_
#define _REPEAT_H_

// Macros defining Repeat Syntax
#define _REPEAT_TIMES_TYPE_(x, type, y) for(type y = x; y--;)
#define _FORWARD_REPEAT_TIMES_TYPE_(x, type, y) for(type y = 0; y < x; y++)
#define _REPEAT_TIMES_(x, y) _REPEAT_TIMES_TYPE_(x, size_t, y)
#define _FORWARD_REPEAT_TIMES_(x, y) _FORWARD_REPEAT_TIMES_TYPE_(x, size_t, y)
#define _REPEAT_(x) _REPEAT_TIMES_(x, _i)
#define _FORWARD_REPEAT_(x) _FORWARD_REPEAT_TIMES_(x, _i)
// Macro overloading from: https://stackoverflow.com/questions/11761703/overloading-macro-on-number-of-arguments
#define _GET_REPEAT_(_1,_2,_3, NAME,...) NAME

// Reverse (optimized) repeat
#define rrepeat(...) _GET_REPEAT_(__VA_ARGS__, _REPEAT_TIMES_TYPE_, _REPEAT_TIMES_, _REPEAT_)(__VA_ARGS__)
#define reverse_repeat(...) rrepeat(__VA_ARGS__)
#define reverseRepeat(...) rrepeat(__VA_ARGS__)
#define ReverseRepeat(...) rrepeat(__VA_ARGS__)

// Forward (index based) repeat
#define frepeat(...) _GET_REPEAT_(__VA_ARGS__, _FORWARD_REPEAT_TIMES_TYPE_, _FORWARD_REPEAT_TIMES_, _FORWARD_REPEAT_)(__VA_ARGS__)
#define forward_repeat(...) frepeat(__VA_ARGS__)
#define forwardRepeat(...) frepeat(__VA_ARGS__)
#define ForwardRepeat(...) frepeat(__VA_ARGS__)

// Default repeat direction
#ifdef REPEAT_FORWARD_DEFAULT
#   define repeat(...) frepeat(__VA_ARGS__)
#else // REPEAT_FORWARD_DEFAULT
#   define repeat(...) rrepeat(__VA_ARGS__)
#endif // REPEAT_FORWARD_DEFAULT
#endif // _REPEAT_H_