test_verify1.py 文件源码

def test_rounding_1():
    ffi = FFI()
    ffi.cdef("double sinf(float x);")
    lib = ffi.verify('#include <math.h>', libraries=lib_m)
    res = lib.sinf(1.23)
    assert res != math.sin(1.23)     # not exact, because of double->float
    assert abs(res - math.sin(1.23)) < 1E-5