What is Javelin?

Javelin is a Python3 to C++11 transpiler written in C++11. When possible, it implies types automatically in Python.

Examples

Recursive Fibonacci

Fibonacci is a nice example of how recursive calls are compiled.

def fib(n):
  if n == 0 or n == 1:
    return 1
  return fib(n - 1) + fib(n - 2)

i = 0
while i < 10:
  print("Fibonacci number " + str(i) + ": " + str(fib(i)))
  i = i + 1

Will transpile into:

#include "inc/javelin.h"
int fib(int n);
int main() {
  int i = 0;
  while (i < 10) {
    std::cout << std::string("Fibonacci number ") +
        std::to_string(i) + std::string(": ") +
        std::to_string(fib(i)) << std::endl;
    i = i + 1;
  }
}
int fib(int n) {
  if (n == 0 || n == 1) {
    return 1;
  }
  return fib(n - 1) + fib(n - 2);
}

List support

We currently support limited list functionality:

i = [[1, 2, 3], [4, 5, 6, 7]]

for foo in i:
    for bar in foo:
        print(bar)
    print("    ")

Compiles into:

#include "inc/javelin.h"
int main() {
  std::vector<std::vector<int>> i = {{1,2,3},{4,5,6,7}};
  for (std::vector<int> foo : i) {
    for (int bar : foo) {
      std::cout << bar << std::endl;
    }
    std::cout << std::string("    ") << std::endl;
  }
}