def load_ool_module():
    """
    Compile an out-of-line module, return the corresponding ffi and
    module objects.
    """
    from cffi import FFI

    numba_complex = """
    typedef struct _numba_complex {
        double real;
        double imag;
    } numba_complex;
    """

    bool_define = """
    #ifdef _MSC_VER
        #define false 0
        #define true 1
        #define bool int
    #else
        #include <stdbool.h>
    #endif
    """

    defs = numba_complex + """
    bool boolean(void);
    double sin(double x);
    double cos(double x);
    int foo(int a, int b, int c);
    void vsSin(int n, float* x, float* y);
    void vdSin(int n, double* x, double* y);
    void vector_real(numba_complex *c, double *real, int n);
    void vector_imag(numba_complex *c, double *imag, int n);
    """

    source = numba_complex + bool_define + """
    static bool boolean(void)
    {
        return true;
    }

    static int foo(int a, int b, int c)
    {
        return a + b * c;
    }

    void vsSin(int n, float* x, float* y) {
        int i;
        for (i=0; i<n; i++)
            y[i] = sin(x[i]);
    }

    void vdSin(int n, double* x, double* y) {
        int i;
        for (i=0; i<n; i++)
            y[i] = sin(x[i]);
    }

    static void vector_real(numba_complex *c, double *real, int n) {
        int i;
        for (i = 0; i < n; i++)
            real[i] = c[i].real;
    }

    static void vector_imag(numba_complex *c, double *imag, int n) {
        int i;
        for (i = 0; i < n; i++)
            imag[i] = c[i].imag;
    }
    """

    ffi = FFI()
    ffi.set_source('cffi_usecases_ool', source)
    ffi.cdef(defs, override=True)
    tmpdir = temp_directory('test_cffi')
    ffi.compile(tmpdir=tmpdir)
    sys.path.append(tmpdir)
    try:
        mod = import_dynamic('cffi_usecases_ool')
        cffi_support.register_module(mod)
        cffi_support.register_type(mod.ffi.typeof('struct _numba_complex'),
                                   complex128)
        return mod.ffi, mod
    finally:
        sys.path.remove(tmpdir)

    Compile an out-of-line module, return the corresponding ffi and
    module objects.
    
numba/tests/cffi_usecases.py