osx - How to pass two Strings from Swift to a C++ function, and getting an array of Integers? -

i trying pass 2 strings swift c++ function, handle them there, , return array of integers (probally vector), not sure yet.

i've tried (c++ function declaration):

void exmaple(char* one, char* two); 

but not able pass strings swift c++.

then changed function little:

void example(void* one, void* two) {     string &a = *reinterpret_cast<string*>(one);     string &b = *reinterpret_cast<string*>(two);      cout<<"string b is: "<<b<<endl; } 

and tried calling function in swift:

let astr = unsafemutablepointer<string>.alloc(10) astr.initialize("stringa")  let bstr = unsafemutablepointer<string>.alloc(10) bstr.initialize("stringb")  example(astr, bstr) 

but output is:

string b is:  

how can pass 2 strings swift c++ function, , return array/vector of integers?

swift has magic bridging allows pass regular swift strings directly c functions. example, strlen has signature size_t strlen(const char *), comes swift func strlen(_: unsafepointer<int8>) -> uint can call ordinary strings this:

import darwin  let greeting: string = "hello!"  strlen(greeting)   // returns 6  strlen("goodbye")  // returns 7 

and compiler automatically generate null-terminated c strings call.

the last part of question trickier unfortunately. not there no bridging c++, c , objective-c, there won't ability pass c++ vector. best bet either go via objective-c layer , pass nsarray, or use c-style pass in empty buffer , have function write values it.