SFINAE-friendly and_then and map
#101
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…ess. This incidentally simplifies the preprocessor stuff, by making these codepaths look the same in both C++11 and C++14. The old code had the weird effect that the C++11 codepath was slightly *more* SFINAE-friendly than the C++14 codepath. This patch doesn't actually make and_then/map/transform/map_error/or_else be SFINAE-friendly. But it lays the groundwork for adding further constraints to the `enable_if` stuff in `and_then_impl` etc., which could make these functions fully SFINAE-friendly without needing to touch the non-`_impl` versions again.
This mainly just swaps two big blocks of code. But it also adds `detail::` in front of every call to `foo_impl`; and it renames `expected_map_impl` to simply `map_impl` because that seems more consistent with the rest of the names.
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I'll do
map_errorandor_elsealso; just poking the CI.This depends on (i.e., is a superset of) #99.