Update common_type to C++17 for SFINAE #557
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Recent C++ standards have made significant changes to common_type, starting with LWG 2408 to make common_type SFINAE-friendly. These changes include the SFINAE-friendliness and add the other changes that C++17 has on top.
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Recent C++ standards have made significant changes to common_type, starting with LWG 2408 to make common_type SFINAE-friendly. These changes include the SFINAE-friendliness and add the other changes that C++17 has on top.
I initially did this to fix #555, but this is not required once #556 is merged. Nevertheless, I have already written the code, so you can consider it for inclusion.