Will Concepts replace SFINAE?

Question

Concepts likely to be in the C++ standard (C++17, or maybe C++20).

So I wonder if this new feature can completely replace SFINAE, or it's just a small version of SFINAE with nice error reports and type checking.

Are there any cases when SFINAE is the only choice instead of using Concepts?

I don't see expression SFINAE being phased out for basic things that don't require full fledged concepts. — Rapptz, Jan 25 '15 at 04:41
What do you mean with "replace SFINAE"? Do you mean that substitution failure would be an error? That would break a lot of existing code. What's the reason for doing that? — D Drmmr, Jan 25 '15 at 13:12
No, I mean that in new code I don't need to use SFINAE anymore. — so61pi, Jan 26 '15 at 01:10
@DDrmmr the question is about the techniques that dispatch between template specializations/overloads using SFINAE, not SFINAE itself I reckon. — Quentin, Feb 06 '17 at 16:50

score 10 · Accepted Answer · answered Feb 06 '17 at 16:44

With concepts taking shape and being implemented in compilers (currently only gcc >= 6.1 with option -fconcepts), it appears that they can do everything that you could have done using SFINAE only much better (much clearer expression of intent and producing concise error messages), and much more (such as abbreviated templates).

So the simple answer is YES.

Will Concepts replace SFINAE?

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