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C++ container to store(insert/get/remove) structure with multi key of integer value is pointer


C++ container to store(insert/get/remove) structure with multi key of integer value is pointer

By : Akshaya Nayak
Date : November 21 2020, 09:01 AM
I wish did fix the issue. How to store following structure Key=[k1,k2,...,kn]; Value=void* n is unknown at compile time. It's constant for object but varies for class. It must be like tree but C++ STL. It must be as fast as it can be for inserting, removing and getting. I think it must be map[integer, map[integer, ... map[integer, void*]...]] but I can't understand how to implement it with unknown level "n". , You could create a simple structure like this:
code :
struct MyType
{
  std::string name;
  std::map<int, MyType> mA;
};
std::map<int, MyType> mRootMap;
MyType a;
MyType b;
MyType c;
c.name = "This is C";
b.mA[789] = c;
a.mA[456] = b;
mRootMap[123] = a; 
std::cout << mRootMap[123].mA[456].mA[789].name << std::endl;
This is C


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Efficient data structure to map integer-to-integer with find & insert, no allocations and fixed upper bound

Efficient data structure to map integer-to-integer with find & insert, no allocations and fixed upper bound


By : Jackson Renehan
Date : March 29 2020, 07:55 AM
wish of those help I ended up implementing a simple linear-probe HashTable from an example here. I used the MurmurHash3 hash function since my data is randomized.
I modified the hash table in the following ways:
How to use std::back_inserter to insert into a container (only have a pointer to container)

How to use std::back_inserter to insert into a container (only have a pointer to container)


By : Liza
Date : March 29 2020, 07:55 AM
I hope this helps . Yes, there's no problem with doing that at all. I'm not really sure what the source of your confusion is, so I'm not sure how to answer "why." If you have a non-const pointer to an object, you're allowed to dereference it and pass it to functions that need a non-const reference (like std::back_inserter).
C - Pass structure pointer VS integer pointer to functions

C - Pass structure pointer VS integer pointer to functions


By : Gabriel López
Date : March 29 2020, 07:55 AM
To fix the issue you can do ,
Why can we not use *head -> data = 6?
code :
(*head).data = 6
Accessing an integer within a structure which has Pointer to structure

Accessing an integer within a structure which has Pointer to structure


By : Mike Evans
Date : March 29 2020, 07:55 AM
To fix this issue I am new to pointers and trying to use a pointer to the structure.I need to access the structure parameter using pointer. Kindly assist me. , Do this instead:
code :
time v = (n_access[3].ptrtoarray + 1)->record;
int c = v.c;
time *v = &(n_access[3].ptrtoarray + 1)->record;
int c = v->c;
access* my_access = &n_access[3];
myarray* array = &my_access->ptrtoarray[1];
time *v = &array->record;
int c = v->c;
Easy way to store structure pointer members within structure into a vector

Easy way to store structure pointer members within structure into a vector


By : Giorgio Cara
Date : March 29 2020, 07:55 AM
it fixes the issue Instead of using pointers and taking on the responsibility for tracking sizes, allocating memory, deallocating memory, etc, you can use std::vector, which will handle all that complexity for you:
code :
#include <vector>

struct Order {
    int part_no;
    int due_date;
    int part_type;
    int pallet;
};

struct Pallet {
    int pallet_no;
    std::vector<int> fixture_types;
    std::vector<Order> parts;
};
int main()
{
    int num_pallets = 0;
    std::cin >> num_pallets;

    std::vector<Pallet> pallets;
    pallets.reserve(num_pallets);
    for (int i = 0; i < num_pallets; ++i)
    {
        Pallet next_pallet;
        next_pallet.pallet_no = i; 

        int num_fixture_types = 0;
        std::cin >> num_fixture_types;

        next_pallet.fixture_types.reserve(num_fixture_types);
        for (int j = 0; j < num_fixture_types; j++)
        {
            int temp_fixture_type = 0;
            std::cin >> temp_fixture_type; 
            next_pallet.fixture_types.push_back(temp_fixture_type);
        }
        pallets.push_back(std::move(next_pallet));
    }

    for (const Pallet& next_pallet : pallets)
    {
        std::cout << "Pallet: " << next_pallet.pallet_no << std::endl;
        std::cout << "Fixture types:\n\t";
        for (int fixture_type : next_pallet.fixture_types)
            std::cout << fixture_type << " ";
        std::cout << std::endl;
    }
}
Pallet: 0
Fixture types:
    1 4 4 
Pallet: 1
Fixture types:
    1 5 1 
Pallet: 2
Fixture types:
    1 5 1 
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