From The FEniCS project

Instant is a Python module that allows for instant inlining of C and C++ code in Python. It is a small Python module built on top of SWIG and Distutils.

Example of use

from instant import inline

add_func = inline("double add(double a, double b){ return a+b; }")

print "The sum of 3 and 4.5 is ", add_func(3, 4.5)

Example with numpy arrays beeing converted to C double arrays

from instant import inline_with_numpy

c_code = """
double sum (int n1, double* array1){
 double tmp = 0.0;
 for (int i=0; i < n1; i++) {
  tmp += array1[i];
 }
 return tmp;
}
"""

sum_func = inline_with_numpy(c_code, arrays = [['n1', 'array1']])

a = numpy.arange(10000000); a = numpy.sin(a)

sum1 = sum_func(a)

On my machine, the above sum function is about three times faster than the corresponding sum function in numpy (see also the file test9.py that comes with the package).

Main authors

Martin Alnæs, Kent-Andre Mardal and Magne Westlie

License

Instant is licensed under the BSD license.

Dependencies and requirements

Instant depends on SWIG.