wcpp v1.2.0
WCPP
A node module to make writing C/C++ in JavaScript not painful.
Using the power of WebAssebly, wcpp projects run both in node and on the web.
npm i -g wcpp
Installing Emscripten
WCPP comes with an Emscripten installer and will automatically source environment variables upon compile.
$ wcpp-install
A C++ File
// addTwo.cpp
export int addTwo(int a, int b) {
return a + b;
}
We need export
to tell our compiler to make this function available to JavaScript.
To compile all of our C/C++ files to wasm, we enter our project root and run:
$ wcpp
The first time running this command will be a bit slow.
You should see a list of C/C++ files that have been compiled.
Our JavaScript
All we have to do now is require our C++ file the same way we would require a JS file.
require('wcpp')
const ourModule = require('./addTwo.cpp')
console.log(ourModule.addTwo(2, 3))
If you want to both use wcpp in the web and inculde a lare C++ file, you'll need to use it asynchronously.
We could put this in an anonymous async function:
;(async () => {
// Require our module
const addTwo = await require('wcpp')('./addTwo.cpp')
console.log(addTwo(2, 3))
})()
Or use it as a promise:
require('wcpp')('./addTwo.cpp').then(addTwo => {
console.log(addTwo(2, 3))
})
Use Functions as Modules
We can make our function into a module by naming the function module
// C++
export int module(int a, int b) {
return a + b;
}
export int timesTwo(int a, int b) { // We can still make other functions
return a * b;
}
// JavaScript
require('wcpp')
const addTwo = await require('./addTwo.cpp')
console.log(addTwo(2, 3))
console.log(addTwo.timesTwo(2, 3)) // Our other function