File size: 2,386 Bytes
9425aed | 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 | ! BOB Quantum Civilization Engine - Type Definitions
! Module: bob_kinds
! Purpose: Explicit kind parameters for portable numeric types
! Standard: Fortran 2018
! Compiler: GNU Fortran (gfortran)
module bob_kinds
use, intrinsic :: iso_c_binding, only: c_int, c_int64_t, c_double, c_float, c_bool, c_char
implicit none
private
! Export C-compatible types
public :: c_int, c_int64_t, c_double, c_float, c_bool, c_char
! Integer kinds
integer, parameter, public :: i4 = c_int ! 32-bit integer
integer, parameter, public :: i8 = c_int64_t ! 64-bit integer
! Real kinds
integer, parameter, public :: sp = c_float ! Single precision (32-bit)
integer, parameter, public :: dp = c_double ! Double precision (64-bit)
! Default working precision for quantum states
integer, parameter, public :: wp = dp ! Working precision = double
! Complex kinds
integer, parameter, public :: cwp = wp ! Complex working precision
! Logical kind
integer, parameter, public :: lk = c_bool ! Logical/boolean
! Character kind
integer, parameter, public :: ck = c_char ! Character
integer, parameter, public :: i1 = 1 ! 1-byte integer (int8)
! Constants
real(wp), parameter, public :: PI = 3.141592653589793238462643383279502884197_wp
real(wp), parameter, public :: QUART = 0.25_wp
real(wp), parameter, public :: HBAR = 1.054571817e-34_wp ! Reduced Planck constant (J·s)
real(wp), parameter, public :: ZERO = 0.0_wp
real(wp), parameter, public :: ONE = 1.0_wp
real(wp), parameter, public :: TWO = 2.0_wp
real(wp), parameter, public :: HALF = 0.5_wp
! Complex constants
complex(cwp), parameter, public :: CZERO = (0.0_wp, 0.0_wp)
complex(cwp), parameter, public :: CONE = (1.0_wp, 0.0_wp)
complex(cwp), parameter, public :: CI = (0.0_wp, 1.0_wp) ! Imaginary unit
! Numerical tolerances
real(wp), parameter, public :: TOL_NORM = 1.0e-10_wp ! Normalization tolerance
real(wp), parameter, public :: TOL_HERMITIAN = 1.0e-12_wp ! Hermiticity tolerance
real(wp), parameter, public :: TOL_UNITARY = 1.0e-10_wp ! Unitarity tolerance
end module bob_kinds
! Made with Bob
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