Control and Query Object Alignment
C++11 allows variable alignment to be queried and controlled with alignof and alignas.
The alignof operator takes a type and returns the power of 2 byte boundary on which the type instances must be allocated (as a std::size_t). When given a reference type alignof returns the referenced type's alignment; for arrays it returns the element type's alignment.
The alignas specifier controls the memory alignment for a variable. The specifier takes a constant or a type; when supplied a type alignas(T) is short hand for alignas(alignof(T)). For example, to specify that a char array should be properly aligned to hold a float:
Read more about this topic: C++11, Core Language Functionality Improvements
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