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Create a constant tuple with Non-optional values and compare with another tuple which has optional values


Create a constant tuple with Non-optional values and compare with another tuple which has optional values

By : saurabh singh
Date : November 22 2020, 04:01 AM
I wish this helpful for you After a few minutes, I found a work around as like below.
let tuple1 = (1, true, true) as (Int?, Bool?, Bool?)
code :


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Create an optional tuple

Create an optional tuple


By : user3772304
Date : March 29 2020, 07:55 AM
This might help you I don't understand why there is no optional tuple, and I mean by that, something like this ; optional that would combine an optional int, optional string and optional char. , You may implement yourself, something similar to:
code :
/**
 *  Similar to `optional`, but take the bool as argument.
 */
template <typename T>
class out_optional
{
public:
    out_optional() {}

    out_optional(const out_optional&) = delete;
    out_optional& operator =(const out_optional&) = delete;

    void destruct(bool b) { if (b) { reset(b); } }

    void reset(bool& b) { if (b) { reinterpret_cast<T*>(data)->~T(); b = false; } }
    void reset(bool& b, const T& value) { reset(b); new (data) T{value}; b = true; }
    void reset(bool& b, T&& value) { reset(b); new (data) T{value}; b = true; }

    const T* get_ptr(bool b) const { return b ? reinterpret_cast<T*>(data) : nullptr; }
    T* get_ptr(bool b) { return b ? reinterpret_cast<T*>(data) : nullptr; }

    const T& get(bool b) const { assert(b); return *get_ptr(b); }
    T& get(bool b) { assert(b); return *get_ptr(b); }

    // Other stuff as swap, pseudo assignment/move, more constructors

private:
    alignas(T) char data[sizeof(T)];
};

/**
 * 'Tuple' of optional, packaged with bool at the end.
 */
template <typename ... Ts>
struct multi_optional
{
    template <std::size_t I>
    using type = typename std::tuple_element<I, std::tuple<Ts...>>::type;

    static_assert(std::is_same<int, type<0>>::value, "");
public:
    multi_optional() = default;

    ~multi_optional()
    {
        destruct(std::index_sequence_for<Ts...>());
    }

    multi_optional(const multi_optional&) = delete; // To be implemented.
    multi_optional& operator =(const multi_optional&) = delete; // To be implemented.

    template <std::size_t I>
    const auto* get_ptr() const { return std::get<I>(data).get_ptr(flags[I]); }

    template <std::size_t I>
    auto* get_ptr() { return std::get<I>(data).get_ptr(flags[I]); }

    template <std::size_t I>
    const auto& get() const { return std::get<I>(data).get(flags[I]); }

    template <std::size_t I>
    auto& get() { return std::get<I>(data).get(flags[I]); }

    template <std::size_t I>
    void reset() { return std::get<I>(data).reset(flags[I]); }

    template <std::size_t I>
    void reset(const type<I>& value) { return std::get<I>(data).reset(flags[I], value); }


   // Other stuff as copy/move assignment/constructor, ...

private:
    template <std::size_t ... Is>
    void destruct(std::index_sequence<Is...>)
    {
        int dummy[] = { 0, (std::get<Is>(data).destruct(flags[Is]), 0)... };
        static_cast<void>(dummy);
    }

private:
    std::tuple<out_optional<Ts>...> data;
    std::array<bool, sizeof...(Ts)> flags = {{}};
};
Swift pattern matching with enum and Optional tuple associated values

Swift pattern matching with enum and Optional tuple associated values


By : Aaron Roberts
Date : March 29 2020, 07:55 AM
fixed the issue. Will look into that further I'm currently using Alamofire and I use an enum to describe the API I used as advised in the readme. , You can use the .Some(x) pattern (.some(x) in Swift 3):
code :
case .GetStops(let .Some(stopCode)):
     return ("GetStops.json", ["stopCode" : stopCode])
case .GetStops(let stopCode?):
     return ("GetStops.json", ["stopCode" : stopCode])
Scala/RDD : How to compare a value of tuple with a list of values in the same tuple

Scala/RDD : How to compare a value of tuple with a list of values in the same tuple


By : user1641083
Date : March 29 2020, 07:55 AM
Any of those help I have data like below , Another way using RDD:
Input:
code :
(1,List(1, 2, 3, 4))
(2,List(1, 2, 3, 4))
(3,List(1, 2, 3, 4))
(4,List(1, 2, 3, 4))

t.map(x => s"""${x._1} -- ${if(x._2.contains(x._1)) x._1}""").collect.foreach(println)  
1 -- 1
2 -- 2
3 -- 3
4 -- 4  
What is the definitive JSON request format for optional values, optional section of values, optional array of values?

What is the definitive JSON request format for optional values, optional section of values, optional array of values?


By : Ajit Mhatre
Date : March 29 2020, 07:55 AM
I hope this helps you . The answer is the same in both cases: It's up to you, but the most common approach is to leave the key off entirely. Nothing says "nothing" like being completely absent.
Swift destructure an optional tuple to individual optional values

Swift destructure an optional tuple to individual optional values


By : nickfromthed
Date : March 29 2020, 07:55 AM
it should still fix some issue A possible solution (thanks to @dfri for simplifying my original attempt):
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