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
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184

//! Constants, static variables and their getter/setter functions.
//!
//! Note: the static variables defined in this module are not thread-safe.
//! Do not change them while multithreading!

use crate::{
    types::{NCTYPE, NFTYPE},
    C, R,
};

/// The imaginary unit.
pub const I: C = C { re: 0., im: 1. };

// The number of colors.
// If you change this line you MUST also change the value of NF_DIV_NC.
static mut NC: NCTYPE = 3;

/// Get the number of colors. Equals `3` if never changed.
#[no_mangle]
pub extern "C" fn get_number_of_colors() -> NCTYPE {
    nc()
}

/// Set the number of colors.
#[no_mangle]
pub extern "C" fn set_number_of_colors(n: NCTYPE) {
    unsafe {
        NC = n;
        NF_DIV_NC = (NF as R) / (NC as R);
    }
}

// This is just an alias to avoid typing "unsafe { NC }" every time.
#[inline(always)]
pub(crate) fn nc() -> NCTYPE {
    unsafe { NC }
}

// The number of fermions.
// If you change this line you MUST also change the value of NF_DIV_NC.
static mut NF: NCTYPE = 1;

/// Get the number of fermions. Equals `1` if never changed.
#[no_mangle]
pub extern "C" fn get_number_of_fermions() -> NFTYPE {
    nf()
}

/// Set the number of fermions.
#[no_mangle]
pub extern "C" fn set_number_of_fermions(n: NFTYPE) {
    unsafe {
        NF = n;
        NF_DIV_NC = (NF as R) / (NC as R);
    }
}

// This is just an alias to avoid typing "unsafe { NF }" every time.
#[inline(always)]
pub(crate) fn nf() -> NCTYPE {
    unsafe { NF }
}

/// The number of fermions divided by the number of colors.
static mut NF_DIV_NC: R = 1. / 3.;

// This is just an alias to avoid typing "unsafe { NF_DIV_NC }" every time.
#[inline(always)]
pub(crate) fn nf_div_nc() -> R {
    unsafe { NF_DIV_NC }
}

/// The default quark mass.
static mut M_QUARK: R = 0.5;

/// Get the default quark mass. Equals `0.5` (in arbitrary units) if never
/// changed.
#[no_mangle]
pub extern "C" fn get_default_quark_mass() -> R {
    m_quark()
}

/// Set the default quark mass.
#[no_mangle]
pub extern "C" fn set_default_quark_mass(m: R) {
    unsafe {
        M_QUARK = m;
    }
}

// This is just an alias to avoid typing "unsafe { M_QUARK }" every time.
#[inline(always)]
pub(crate) fn m_quark() -> R {
    unsafe { M_QUARK }
}

/// The default tolerance for numerical integrals.
static mut TOL_INTEGRAL: R = 1E-10;

/// Get the default tolerance for numerical integrals. Equals `1E-10` if never
/// changed.
#[no_mangle]
pub extern "C" fn get_default_tol_integral() -> R {
    tol_integral()
}

/// Set the default tolerance for numerical integrals.
///
/// # Panics
///
/// This function panics if `tol <= 0.`.
#[no_mangle]
pub extern "C" fn set_default_tol_integral(tol: R) {
    assert!(tol > 0.);
    unsafe {
        TOL_INTEGRAL = tol;
    }
}

// This is just an alias to avoid typing "unsafe { TOL_INTEGRAL }" every time.
#[inline(always)]
pub(crate) fn tol_integral() -> R {
    unsafe { TOL_INTEGRAL }
}

/// The default maximum number of iterations for numerical integrals.
static mut MAX_ITER_INTEGRAL: u32 = 50;

/// Get the default maximum number of iterations for numerical integrals.
/// Equals `50` if never changed.
#[no_mangle]
pub extern "C" fn get_default_max_iter_integral() -> u32 {
    max_iter_integral()
}

/// Set the default maximum number of iterations for numerical integrals.
#[no_mangle]
pub extern "C" fn set_default_max_iter_integral(iter: u32) {
    unsafe {
        MAX_ITER_INTEGRAL = iter;
    }
}

// This is just an alias to avoid typing "unsafe { MAX_ITER_INTEGRAL }" every time.
#[inline(always)]
pub(crate) fn max_iter_integral() -> u32 {
    unsafe { MAX_ITER_INTEGRAL }
}

/// Get the default integration method. Equals
/// `crate::Integral::G7K15(tol_integral(), max_iter_integral())` if never
/// changed.
pub fn get_default_integration_method() -> crate::Integral {
    crate::Integral::G7K15(tol_integral(), max_iter_integral())
}

/// The regulator for integrals in the matsubara limit.
static mut MATSUBARA_REG: R = 1E-5;

/// Get the regulator for integrals in the matsubara limit. Equals `1E-5` if never
/// changed.
#[no_mangle]
pub extern "C" fn get_matsubara_reg() -> R {
    matsubara_reg()
}

/// Set the regulator for integrals in the matsubara limit.
///
/// # Panics
///
/// This function panics if `reg <= 0.`.
#[no_mangle]
pub extern "C" fn set_matsubara_reg(reg: R) {
    assert!(reg > 0.);
    unsafe {
        MATSUBARA_REG = reg;
    }
}

// This is just an alias to avoid typing "unsafe { MATSUBARA_REG }" every time.
#[inline(always)]
pub(crate) fn matsubara_reg() -> R {
    unsafe { MATSUBARA_REG }
}