Uniform initialization

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一个初始化列表是一个列表，括号（{}）初始化，可以用来初始化简单聚合数据类型和类实现std:：initializer_list：

Uniform initialization

As noted above, C++03 is inconsistent in how it lets you initialize different types of data. Initializer lists go a long way to helping making initialization of data more consistent. However, C++11 has one more trick up its sleeve called uniform initialization. Unlike initializer lists, which take the form:

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type variable = { data, elements };

The uniform initialization syntax takes the following form:

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type variable { data, elements }; // note: no assignment operator

This style of initialization will work for both plain aggregate data types (structs and C-style arrays) and classes. For classes, the following rules are observed:

If there is an initialization_list constructor of the appropriate type, that constructor is used
Otherwise the class elements are initialized using the appropriate constructor

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