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DPL: get rid of call_if_defined #14792

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Merged
ktf merged 1 commit into from
Nov 4, 2025
Merged

DPL: get rid of call_if_defined #14792

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31 changes: 7 additions & 24 deletions Framework/Foundation/include/Framework/CheckTypes.h
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Original file line number Diff line number Diff line change
Expand Up @@ -18,13 +18,15 @@
namespace o2::framework
{

/// Helper to understand if a given type is complete (declared fully) or not (forward declared).
/// See also: https://devblogs.microsoft.com/oldnewthing/20190710-00/?p=102678
template <typename, typename = void>
constexpr bool is_type_complete_v = false;
template <typename T>
concept TypeComplete = requires(T) {
{
sizeof(T)
};
};

template <typename T>
constexpr bool is_type_complete_v<T, std::void_t<decltype(sizeof(T))>> = true;
constexpr bool is_type_complete_v = TypeComplete<T>;

/// Helper which will invoke @a onDefined if the type T is actually available
/// or @a onUndefined if the type T is a forward declaration.
Expand All @@ -39,31 +41,12 @@ void call_if_defined_full(TDefined&& onDefined, TUndefined&& onUndefined)
}
}

/// Helper which will invoke @a onDefined if the type T is actually available
/// or @a onUndefined if the type T is a forward declaration.
/// Can be used to check for existence or not of a given type.
template <typename T, typename TDefined, typename TUndefined>
T call_if_defined_full_forward(TDefined&& onDefined, TUndefined&& onUndefined)
{
if constexpr (is_type_complete_v<T>) {
return std::move(onDefined(static_cast<T*>(nullptr)));
} else {
return onUndefined();
}
}

template <typename T, typename TDefined>
void call_if_defined(TDefined&& onDefined)
{
call_if_defined_full<T>(onDefined, []() -> void {});
}

template <typename T, typename TDefined>
T call_if_defined_forward(TDefined&& onDefined)
{
return std::move(call_if_defined_full_forward<T>(onDefined, []() -> T&& { O2_BUILTIN_UNREACHABLE(); }));
}

} // namespace o2::framework

#endif // O2_FRAMEWORK_CHECKTYPES_H_