Common bicycles which will be used in every other repo

To use any of kcommon headers add "kcommon/include" to include path. Example of including c_util header:
#include "kcommon/c_util.h"

You could use following headers:

• c_util.h - common functions and types
• c_geometry.h - common functions and types for geometry calculations and linear algebra

This header contains common generic functions and types. All functions have comments and almost self-descriptive. There are several useful struct templates for point, size and rectangle representations. All stuff is declared under c_util namespace.

pointT template is intended to represent simple 2D point with x and y coordinates. Point can be constructed from single value (same for both x and y) or pair of values. Two points can be added or subtracted with each other like 2D vectors. Point can be multiplied or divided by scalar value.

sizeT template is intended to represent simple 2D dimensions width and height. All functions of size template are self-descriptive and have comments in header.

rectT template is intended to represent 2D rectangle with left, top, right and bottom. Rectangle can be "denormalized", this means that its width or height could be negative (e.g., left is greater than right). The size() method or implicit casting to sizeT always return normalized (positive) rectangle dimensions. Also, inflate(), unionwith(), intersectionwith(), intersects() and contains() use normalized internal copy of original rectangle to produce correct result.

To use equal() function you should define abs(value) function, which returns absolute value.
One from <stdlib.h> or <cmath> is suitable, include one of these headers before

The rectT<T>::bounds() function uses std::numeric_limits. You should include <limits> in order to use this function.

This header contains functions and types related to geometry. Handy structs for vectors and matrices have common set of methods and organized similalry. Vector types represent n-dimensional points (or vectors) in space. These types are vec2, vec3 and vec4. Matrix types represent rectangular matrices with different sizes. These types are mat2x2, mat3x2, mat3x3 and mat4x4. Other useful types are ray and segment for 2D and 3D versions of rays (straight infinte line originated at certain point) and segments (straight line between to points).