Since then, C++17 has clarified the evaluation order, making Syntax A safe too, so here's my question: is there still a reason to use std::make_unique over std::unique_ptr 's constructor in C++17? Can you give some examples? As of now, the only reason I can imagine is that it allows to type MyClass only once (assuming you don't need to rely on polymorphism with std::unique_ptr(new ...
The difference is that std::make_unique returns an object of type std::unique_ptr and new returns a pointer to the created object. For memory allocation failures, they will both throw.
How would you deal with polymorphism without new? For example, you need a container of entities, the exact type of which is defined at runtime, and use std::unique_ptr rather than raw pointers: std::vector< std::unique_ptr > entities;. You have to use entities.emplace_back(new Derived); if you want to add elements of the derived class, as far as I can think.
If you look at the cppreference doc for std::make_unique(), it shows a possible implementation that (with minor tweaks) can be applied to C++11 code. If your code doesn't need to worry about std::unique support for arrays, then the simplest implementation would look like this:
These new functions are different: Original make_XYZ: Always initializes the pointed-to value ("explicit initialization", see § class.expl.init in the standard). New make_XYZ_for_overwrite: Performs "default initialization" of the pointed-to value (see § dcl.init, paragraph 7 in the standard); on typical machines, this means effectively no initialization for non-class, non-array types. (Yes ...
The reason you can return std::make_unique from a function declared to return std::unique_ptr is that there is a conversion from one to the other.
some_func(std::make_unique(), std::make_unique()); Now that we are calling a function, the new will be called before the constructor for each parameter in that order. If the first parameter throws an exception, the second allocation won't even have happened. Vs. unique_ptr::reset we just have convenience.
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