C++ using std::set remove duplicate item for a struct fail.

C++ using std::set remove duplicate item for a struct fail.

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C++ using std::set remove duplicate item for a struct fail.
Tag : cpp , By : ezzze
Date : November 24 2020, 05:44 AM

wish help you to fix your issue std::set detects duplicates by means of the trichotomy law, which states that if !cmp(a, b) && !cmp(b, a) then eq(a, b), for some order relation cmp and some equivalence relation eq. If you want eq to stand for equal, you need to provide a order relation cmp that models a strict total ordering between TokenTerms. One such ordering is the lexicographical order, which can be readily achieved by way of std::tie. Here's a complete example:
#include <set>
#include <tuple>
#include <string>
#include <iostream>

typedef unsigned int uint32_t;

struct TokenTerm {
    std::string     value;
    std::string     type;
    uint32_t        start_pos;
    uint32_t        end_pos;

struct TokenTermCmp {
    bool operator()(TokenTerm const& x, TokenTerm const& y) const {
        return std::tie(x.value, x.type, x.start_pos, x.end_pos) < std::tie(y.value, y.type, y.start_pos, y.end_pos);

int main() {
    std::set<TokenTerm, TokenTermCmp> tokens;
    tokens.insert({"value", "type", 0, 10});
    tokens.insert({"value", "type", 0, 10});

    for (auto&& token: tokens) 
        std::cout << token.value << ", "
                  << token.type << ", "
                  << token.start_pos << ", "         
                  << token.end_pos
                  << '\n';

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Linq to XML: Remove duplicate from an item

Tag : chash , By : jay
Date : March 29 2020, 07:55 AM
To fix the issue you can do I have an xml file containing things like these:
var contents = XDocument.Parse(xml);

// Select only elements that have the language attribute
var result = from item in contents.Descendants()
             where item.Attribute("language") != null
             select item;

// Returns only those elements that have at least another element
// with the same value.
var resultDuplicates = result
    .GroupBy(s => s.Value)
    .SelectMany(grp => grp.Skip(1));

// If duplicates found, replace them in the original xml.
if (resultDuplicates.Count() > 0)
    foreach(var entry in resultDuplicates)
        xml = xml.Replace(entry.ToString(), string.Empty);

BOOLEAN allocate_items(struct item * items, size_t howmany) function for allocate an array of struct item

Tag : c , By : DotNetWise
Date : March 29 2020, 07:55 AM
around this issue First of all, both line 4 and 6, as you mentioned seems to be OK.
That said, the basic problem with this function is, you're allocating memory to a local scope of variable. This way

Remove Item from Struct (Swift)

Tag : ios , By : ERaubenheimer
Date : March 29 2020, 07:55 AM
I hope this helps you . Find the index of object and remove it, which matches your song title and artist
let index = favoriteSongs.index{ $0.title == songs[thisSong].title && $0.artist == songs[thisSong].artist}
if let index = index {
    favoriteSongs.remove(at: index)

How to remove duplicate item in Dart

Tag : dart , By : DonMac
Date : March 29 2020, 07:55 AM
To fix this issue So here is how i set my data
class Notification {
  final String notificationId;
  bool operator ==(o) => o is Notification && notificationId == o.notificationId;
  int get hashCode => notificationId.hashCode;

Remove duplicate structs in array based on struct property in Swift

Tag : ios , By : Eric
Date : March 29 2020, 07:55 AM
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