mochow13

body .gist .highlight {
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body .gist .blob-num,
body .gist .blob-code-inner,
body .gist .pl-s2,
body .gist .pl-stj {
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body .gist .pl-c1 {

mochow13

std::vector<int> collection = {3, 6, 12, 6, 9, 12};

// Are all numbers divisible by 3?
// divby3 should equal 1
bool divby3 = std::all_of(begin(collection), end(collection), [](int x) {
    return x % 3 == 0;
});

// Is any number divisible by 2?
// divby2 equals true

mochow13

std::vector<int> collection={2,4,4,1,1,3,9};

// notice that we pass x as reference!
std::for_each(begin(collection),end(collection),[](int &x) {
    x=x*26;
});

mochow13

std::vector<int> collection={1,9,9,4,2,6};

// How many 9s are there in collection?
int nines=std::count(begin(collection),end(collection),9);
// How many elements of the collection are even?
int evens=std::count_if(begin(collection),end(collection),[](int x) {
    return x%2==0;
});
// nines equals 2, evens equals 3

mochow13

std::string mirror_ends(const std::string& in)
{
    // mismatch takes two ranges as input, (first1,last1,first2,last2)
    // if last2 is not given, it considers first2+(last1-first1) as last2
    return std::string(in.begin(), std::mismatch(in.begin(), in.end(), in.rbegin()).first);
}
 
int main()
{
    std::cout << mirror_ends("abXYZba") << '\n'

mochow13

std::vector<int> collection={1,2,0,5,0,3,4};

// itr contains the iterator to the first element following the specific property
auto itr = std::find_if(begin(collection), end(collection), [](int x) {
    return x%2==0; // the property
});

mochow13

std::vector<int> collection={1,2,0,5,0,3,4};

int counter=0;

// notice that we are capturing counter by reference
std::generate(begin(collection), end(collection), [&]() {
    return counter++;
});
// collection gets replaced by values starting from 0
// modified collection = {0,1,2,3,4,5,6}

mochow13

std::vector<int> collection={1,2,13,5,12,3,4};

// rotating to the left
// element at position 3 of the original collection is now the
// first element of the rotated collection
std::rotate(begin(collection), begin(collection)+3, end(collection));

// rotating to the right
// element at position 2 from the end (or at position 4) is now the
// last element of the rotated collection

mochow13

std::vector<int> collection={1,2,13,5,12,3,4};

std::random_device rd;
std::mt19937 rand_gen(rd());
std::shuffle(begin(collection), end(collection), rand_gen);

mochow13

std::vector<int> collection={1,2,13,5,12,3,4};

auto median_pos=collection.begin()+collection.size()/2;
std::nth_element(begin(collection),median_pos,end(collection));
// note that the original vector will be changed due to the operations
// done by nth_element