C++ : Is it defined behavior to use placement new to change type of variable that is held by referen

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C++ : Is it defined behavior to use placement new to change type of variable that is held by reference_wrapper?
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C++ : Is it defined behavior to use placement new to change type of variable that is held by reference_wrapper?
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it is C++ change that placement held use of defined type new Is variable to by : to behavior reference_wrapper?



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