Assign from values in initializer list. All existing elements are either overwritten by the new elements or destroyed.
Assign from values in initializer list. All existing elements are either overwritten by the new elements or destroyed.从初始化列表中的值进行赋值。所有现有元素要么被新元素覆盖，要么被销毁。
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Assign from values in initializer list. All existing elements are either overwritten by the new elements or destroyed.从初始化列表中的值进行赋值。所有现有元素要么被新元素覆盖，要么被销毁。