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Fix partial specialization problem for filesystem for Visual Studio (#2957)

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* #2954: Provide std::conjunction and std::disjunction substitutes

* #2954: Use conjunction and disjunction substitute to make formatter specializations for ranges and maps more robust (especially for Visual Studio compiler family)

* #2954: As workaround for older MSVC compilers split formatter<std::filesystem::path> partial template specialization into two explicit specialization.

* 2954: Add test case

* Provide simplified implementations of conjunction and disjunction

* Remove workaround explicit specializations if the partial specialization would cause an ambiguity error

* Eliminate extra-test and merge it into existing std-test instead. Add conditionals for filesystem::path testing that does not run into the ambiguity problem.
This commit is contained in:
Daniel Krügler
2022-07-03 11:06:54 -07:00
committed by GitHub
parent 0c06c81da8
commit d2a2320820
4 changed files with 66 additions and 17 deletions
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include/fmt/core.h
+18
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@@ -306,6 +306,24 @@ template <typename T> using type_identity_t = typename type_identity<T>::type;
template <typename T>
using underlying_t = typename std::underlying_type<T>::type;
template <typename...>
struct disjunction : std::false_type {};
template <typename P>
struct disjunction<P> : P {};
template <typename P1, typename... Pn>
struct disjunction<P1, Pn...>
: conditional_t<bool(P1::value), P1, disjunction<Pn...>> {
};
template <typename...>
struct conjunction : std::true_type {};
template <typename P>
struct conjunction<P> : P {};
template <typename P1, typename... Pn>
struct conjunction<P1, Pn...>
: conditional_t<bool(P1::value), conjunction<Pn...>, P1> {
};
struct monostate {
constexpr monostate() {}
};