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int src[] = {1,2,3,4,5,6,7,8};
auto dst = from(src).where( [](int a){return a%2 == 1;})    // 1,3,5,7
                    .select([](int a){return a*2;})         // 2,6,10,14
                    .where( [](int a){return a>2 && a<12;}) // 6,10
                    .toVector();

// dst type: std::vector<int>
// dst items: 6,10

struct Man
{
    std::string name;
    int age;
};

Man src[] =
{
    {"Kevin",14},
    {"Anton",18},
    {"Agata",17},
    {"Terra",20},
    {"Layer",15},
};

auto dst = from(src).where(  [](const Man & man){return man.age < 18;})
                    .orderBy([](const Man & man){return man.age;})
                    .select( [](const Man & man){return man.name;})
                    .toVector();

// dst type: std::vector<std::string>
// dst items: "Kevin", "Layer", "Agata"

struct Message
{
    std::string PhoneA;
    std::string PhoneB;
    std::string Text;
};

Message messages[] =
{
    {"Anton","Troll","Hello, friend!"},
    {"Denis","Wride","OLOLO"},
    {"Anton","Papay","WTF?"},
    {"Denis","Maloy","How r u?"},
    {"Denis","Wride","Param-pareram!"},
};

int DenisUniqueContactCount =
    from(messages).where(   [](const Message & msg){return msg.PhoneA == "Denis";})
                  .distinct([](const Message & msg){return msg.PhoneB;})
                  .count();

// DenisUniqueContactCount == 2