What is the best way to call C/C++ code from other languages such as Java, PHP, Perl, Python, etc?

Question

What is the best way to call C/C++ from other languages such as Java, Python, Perl, PHP, etc?

Answer 1

Use Swig, it allows you to generate code for multiple languages that calls any C/C++ functions. http://www.swig.org/

Answer 2

From Perl

Inline::C
Inline::CPP
Inline::Java
Inline::Python
Inline::Lua

excerpt from Inline::C-Cookbook:

use Inline C => <<'END_C';

  void greet() {
    printf("Hello, world\n");
  }
END_C

greet;