Demonstrate how to use boost in WASM

Generate example.js and example.wasm

emcc example.cpp -o example.js -sMODULARIZE -sEXPORTED_RUNTIME_METHODS=ccall,cwrap -sUSE_BOOST_HEADERS=1 -s "EXPORTED_FUNCTIONS=['_free','_malloc']"

if you don't want to use ccall or cwrap in js:

emcc example.cpp -o example.js -sMODULARIZE -sUSE_BOOST_HEADERS=1 -s "EXPORTED_FUNCTIONS=['_free','_malloc']"

Test:

node testBoost.js

Reference:

1. https://emscripten.org/docs/porting/connecting_cpp_and_javascript/Interacting-with-code.html#calling-compiled-c-functions-from-javascript-using-ccall-cwrap
2. https://emscripten.org/docs/compiling/Building-Projects.html#using-libraries
3. https://emscripten.org/docs/compiling/Building-Projects.html#emscripten-ports
4. https://stackoverflow.com/questions/71681491/passing-arrays-and-objects-from-javascript-to-c-in-web-assembly