Здравствуйте, Eeel, Вы писали:

E>По сути, это union. Но, насколько я понимаю, через union по стандарту C++ этого делать нельзя, так как это нарушение strict aliasing и UB (записывать один тип, а читать другой, несовместимый, тип).

Strictly speaking, reading a member of a union different from the one written to is undefined in ANSI/ISO C99 except in the special case of type-punning to a char*, similar to the example below: Casting to char*. However, it is an extremely common idiom and is well-supported by all major compilers. As a practical matter, reading and writing to any member of a union, in any order, is acceptable practice.

http://cellperformance.beyond3d.com/articles/2006/06/understanding-strict-aliasing.html