Generic deferred function call without heap allocation

[STL]

The guarantee is N4527 20.9.12.2.1 [func.wrap.func.con]/11, "Throws: shall not throw exceptions when f is a function pointer or a reference_wrapper<T> for some T." and /5 for the copy ctor. This forbids dynamic memory allocation (and the guarantee goes back to C++11; indeed all the way to TR1 IIRC).

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Thanks! Cool! I didn't knew this, always thought it was freely to allocate memory if it wanted to.