CODEWITHSUNDEEP
c++c++11vectorstd
Aaron
Aaron

Reputation: 37

How to find out if a struct is present in a vector of structs by a variable within the struct

I want to check if an element is present in the vector or not. I searched for answers and I found this

if (std::find(vector.begin(), vector.end(), item) != vector.end())
    do_this();
else
    do_that();

What if the vector is of type structure. Can we still use this to find if there is match in the vector. I want to find in the vector using the field id in the struct entry. Is it possible??

struct entry {
    int id;
    int array[4] = {};
    int aray[4] = {};
};

Upvotes: 2

Views: 1424

Answers (1)

CinCout
CinCout

Reputation: 9619

What you need is std::find_if():

auto it = std::find_if(vec.begin(), vec.end(), [](S s) { return 5 == s.id; } );
if (vec.end() != it)
    do_this(); // it now points to the S instance found in the vector
else
    do_that();

Upvotes: 2

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