"""
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Use cffi to access any of the underlying C functions from distributions.h
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"""
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import os
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import numpy as np
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import cffi
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from .parse import parse_distributions_h
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ffi = cffi.FFI()
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inc_dir = os.path.join(np.get_include(), 'numpy')
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# Basic numpy types
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ffi.cdef('''
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typedef intptr_t npy_intp;
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typedef unsigned char npy_bool;
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''')
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parse_distributions_h(ffi, inc_dir)
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lib = ffi.dlopen(np.random._generator.__file__)
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# Compare the distributions.h random_standard_normal_fill to
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# Generator.standard_random
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bit_gen = np.random.PCG64()
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rng = np.random.Generator(bit_gen)
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state = bit_gen.state
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interface = rng.bit_generator.cffi
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n = 100
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vals_cffi = ffi.new('double[%d]' % n)
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lib.random_standard_normal_fill(interface.bit_generator, n, vals_cffi)
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# reset the state
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bit_gen.state = state
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vals = rng.standard_normal(n)
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for i in range(n):
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assert vals[i] == vals_cffi[i]
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