Returning any data type

[tomus85]

Morning,

I know this isn't the right place to ask as I don't have an issue with the library. It's more of C++ support. I have looked everywhere on Google and haven't found a solution. I hope you don't mind helping me out, I would very much appreciated it, cheers :-)

I am creating a caching class in C++ so that It can be used in iOS and Android. I have created a simple class, this class is a singleton class:

using json = nlohmann::json;
using namespace std;

class Cache
{
private:
static Cache *instance;
json j;

Cache() {};
Cache(Cache const&)             = delete;
void operator=(Cache const&)    = delete;

public:
static bool fileExists();
static Cache* getInstance();

template<typename T> void add(string key, T t) { j[key] = t; }

// template T get(string key) { return j[key]; }

void persist();

string toString();

};

This is what I have implemented in Objective-C class
cache = Cache::getInstance();

    cache->add("test", "test");
    cache->add("name", true);
    cache->add("again", 199.9);
    NSLog(@"%s", cache->toString().c_str());

So far the result is what I am expecting however I am trying to implement the 'get' method. As you can see I have comment this out in the header file. I would like to implement this method so that whatever key i pass in the parameter I get the value associated with the key. For example

cache->get("test") would return string "test"
cache->get("name") returns bool true
and so on.

What I have commented out requires this syntax 'cache->get<>("key")'.
I would very much appreciate if I could get help implementing the 'get' method.

If this is not the right place to ask as this is not an issue with the framework then I will remove this thread.

Thank you for your time ;-)