"""
 Copyright (C) 2017 M.A.L. Marques

 This Source Code Form is subject to the terms of the Mozilla Public
 License, v. 2.0. If a copy of the MPL was not distributed with this
 file, You can obtain one at http://mozilla.org/MPL/2.0/.
"""

# type: lda_exc
# prefix:
#   lda_c_wigner_params *params;
#
#   assert(p->params != NULL);
#   params = (lda_c_wigner_params * )(p->params);

from libxc_codegen import *  # noqa: F401, F403

params_a_a = param_default("a")
params_a_b = param_default("b")

def f(rs, z):
    return one_minus_z_pow_n(z, Integer(2))*params_a_a/(params_a_b + rs)

TYPE = "lda_exc"
PARAMS_STRUCT = "lda_c_wigner_params"
