Question

I have played a lot the new Uniform Initialization with {}. Like this:

vector<int> x = {1,2,3,4};
map<int,string> getMap() {
    return { {1,"hello"}, {2,"you"} };
}

It is undisputed that this initialization may change we program C++.
But I wonder if I missed some of the magic possibilities when reading Alfonses’s question in the Herb Sutter FAQs.

Alfonse: Uniform initialization (the use of {} to call constructors when the type being constructed can be deduced) has the potential to radically reduce the quantity of typing necessary to create C++ types. It’s the kind of thing, like lambdas, that will change how people write C++ code. […]

Can someone give me an example of what Alfonse exactly envisions here?

Answer 1

I assume he means that

std::vector<int> x{1, 2, 3, 4};
std::map<int, std::string> y{{1, "hello"}, {2, "you"}};

is significantly less typing than

std::vector<int> x;
x.push_back(1);
x.push_back(2);
x.push_back(3);
x.push_back(4);
std::map<int, std::string> y;
y.emplace(1, "hello");
y.emplace(2, "you");