Converting a std::vector into an NSArray

nsarray.mm

//clang++ -std=c++11 -stdlib=libc++ -framework Foundation nsarray.mm -o nsarray
/* Note:
 * - libstdc++ has been frozen by Apple at a pre-C++11 version, so you must opt
     for the newer, BSD-licensed libc++
 * - Apple clang 4.0 (based on LLVM 3.1svn) does not default to C++11 yet, so
     you must explicitly specify this language standard. */
/* @file nsarray.mm
 * @author Jeremy W. Sherman
 *
 * Demonstrates three different approaches to converting a std::vector
 * into an NSArray. */
#import <Foundation/Foundation.h>
#include <algorithm>
#include <string>
#include <vector>

int
main(void)
{
	@autoreleasepool {
	/* initializer list */
	std::vector<std::string> strings = {"a", "b", "c"};

	/* uniform initialization */
	//std::vector<std::string> strings{"a", "b", "c"};

	/* Exploiting Clang's block->lambda bridging. */
	id nsstrings = [NSMutableArray new];
	std::for_each(strings.begin(), strings.end(), ^(std::string str) {
		id nsstr = [NSString stringWithUTF8String:str.c_str()];
		[nsstrings addObject:nsstr];
	});
	NSLog(@"nsstrings: %@", nsstrings);

	/* Using a lambda directly. */
	[nsstrings removeAllObjects];
	std::for_each(strings.begin(), strings.end(),
		[&nsstrings](std::string str) {
			id nsstr = [NSString stringWithUTF8String:str.c_str()];
			[nsstrings addObject:nsstr];
		});
	NSLog(@"nsstrings: %@", nsstrings);

	/* Now with a range-based for loop. */
	[nsstrings removeAllObjects];
	for (auto str : strings) {
		id nsstr = [NSString stringWithUTF8String:str.c_str()];
		[nsstrings addObject:nsstr];
	}
	NSLog(@"nsstrings: %@", nsstrings);
	return 0;
	}
}