initialization - 如何使用统一初始值设定项 "reduce typing to create C++ types"？

Question

我用 {} 玩过很多新的统一初始化。像这样:

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

毫无疑问，这个初始化可能会改变我们的 C++ 编程。但我想知道在阅读 Herb Sutter FAQs 中 Alfonses 的问题时，我是否错过了一些神奇的可能性。 。

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. [...]

有人可以给我一个例子来说明 Alfonse 在这里的具体设想吗？

Answer 1

我猜他是这个意思

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

打字次数明显少于

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");