Objective-C++ NSString wrapper example

test.mm

// $ g++ -o test -framework Foundation -Wall test.mm
// $ ./test
// The string length is 12
// The string third char value is 108
// The string is Hello World!

#include <iostream>
#import <Foundation/Foundation.h>

class MyCppNSStringWrapper
{
public:
  MyCppNSStringWrapper(const char* str);
  virtual ~MyCppNSStringWrapper();
  unsigned int length() const;
  short characterAtIndex(unsigned int index) const;
  const char* UTF8String() const;
private:
  NSString* _internal;
};

MyCppNSStringWrapper::MyCppNSStringWrapper(const char* str)
{
  _internal = [[NSString alloc] initWithCString:str
                                       encoding:NSUTF8StringEncoding];
}

MyCppNSStringWrapper::~MyCppNSStringWrapper()
{
  [_internal release];
  _internal = nil;
}

unsigned int MyCppNSStringWrapper::length() const
{
  return [_internal length];
}

short MyCppNSStringWrapper::characterAtIndex(unsigned int index) const
{
  return [_internal characterAtIndex:index];
}

const char* MyCppNSStringWrapper::UTF8String() const
{
  return [_internal UTF8String];
}

extern "C" int main(int argc, char** argv)
{
  NSAutoreleasePool* pool = [[NSAutoreleasePool alloc] init];
  
  MyCppNSStringWrapper* s = new MyCppNSStringWrapper("Hello World!");
  
  std::cout << "The string length is " << s->length() << std::endl;
  std::cout << "The string third char value is " << s->characterAtIndex(2) << std::endl;
  std::cout << "The string is " << s->UTF8String() << std::endl;

  [pool release];
  return 0;
}