common_fwd.h

#pragma once

#include <cstdint> // for standard integer types
#include <cmath> // for float_t and double_t

/*
 * Fastest minimum-width integer types [C11 Standard (ISO/IEC 9899:2011) Section 7.20.1.3]
 *
 * Each of the following types designates an integer type that is usually fastest to operate
 * with among all integer types that have at least the specified width.
 *
 * The designated type is not guaranteed to be fastest for all purposes; if the implementation has no
 * clear grounds for choosing one type over another, it will simply pick some integer type satisfying
 * the signedness and width requirements.
 *
 * The typedef name int_fastN_t designates the fastest signed integer type with a width of at least N.
 * The typedef name uint_fastN_t designates the fastest unsigned integer type with a width of at
 * least N.
*/

typedef int_fast8_t int8; // -128 to 127
typedef uint_fast8_t uint8; // 0 to 255

typedef int_fast16_t int16; // -32,768 to 32,767
typedef uint_fast16_t uint16; // 0 to 65,535

typedef int_fast32_t int32; // -2,147,483,648 to 2,147,483,647
typedef uint_fast32_t uint32; // 0 to 4,294,967,295

typedef int_fast64_t int64; // -9,223,372,036,854,775,808 to 9,223,372,036,854,775,807
typedef uint_fast64_t uint64; // 0 to 18,446,744,073,709,551,615

typedef float_t real32; // 3.4E +/- 38 (7 digits)
typedef double_t real64; // 1.7E +/- 308 (15 digits)