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[STF] Replace type_name implementation with cuda::std::__pretty_nameof wrapper #8194

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Merged
caugonnet merged 3 commits into from
Mar 27, 2026
+5 −47
Merged

[STF] Replace type_name implementation with cuda::std::__pretty_nameof wrapper #8194

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ee7be5d
Replace STF type_name implementation with cuda::std::__pretty_nameof …
caugonnet Mar 26, 2026
a070c44
Merge branch 'main' into stf_type_name_traits
caugonnet Mar 26, 2026
4354579
Merge branch 'main' into stf_type_name_traits
caugonnet Mar 27, 2026
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52 changes: 5 additions & 47 deletions cudax/include/cuda/experimental/__stf/utility/traits.cuh
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Original file line number Diff line number Diff line change
Expand Up @@ -26,6 +26,7 @@
#endif // no system header

#include <cuda/std/__utility/exception_guard.h>
#include <cuda/std/__utility/typeid.h>
#include <cuda/std/mdspan>

#include <cuda/experimental/__stf/utility/core.cuh>
Expand All @@ -37,62 +38,19 @@

namespace cuda::experimental::stf
{
namespace reserved
{
// We use this function as a detector for what __PRETTY_FUNCTION__ looks like
template <typename T>
constexpr ::std::string_view type_name_IMPL()
{
#if _CCCL_COMPILER(MSVC)
return __FUNCSIG__;
#else // ^^^ _CCCL_COMPILER(MSVC) ^^^ / vvv !_CCCL_COMPILER(MSVC) vvv
return __PRETTY_FUNCTION__;
#endif // !_CCCL_COMPILER(MSVC)
}

// Length of prefix and suffix in __PRETTY_FUNCTION__ when used with `type_name`.
inline constexpr ::std::pair<size_t, size_t> type_name_affixes = [] {
const auto p = type_name_IMPL<double>();
const auto target = ::std::string_view("double");
const auto len = target.size();
// Simulate p.find() by hand because clang can't do it.
size_t i = target.npos;
for (std::size_t start = 0; start <= p.size() - len; ++start)
{
if (p.substr(start, len) == target)
{
i = start; // Found the substring, set i to the starting position
break; // Exit loop after finding the first match
}
}
auto j = p.size() - i - len;
return ::std::pair{i, j};
}();

template <class T>
constexpr ::std::string_view type_name_impl()
{
#if _CCCL_COMPILER(MSVC)
constexpr ::std::string_view p = __FUNCSIG__;
// MSVC does not provide constexpr methods so we make this utility much simpler and return __FUNCSIG__ directly
return p;
#else // ^^^ _CCCL_COMPILER(MSVC) ^^^ / vvv !_CCCL_COMPILER(MSVC) vvv
::std::string_view p = __PRETTY_FUNCTION__;
return p.substr(type_name_affixes.first, p.size() - type_name_affixes.first - type_name_affixes.second);
#endif // !_CCCL_COMPILER(MSVC)
}
} // namespace reserved

/**
* @brief Yields a string form of type name. Exact spelling not guaranteed (e.g. `type_name<int*>` may be `"int*"`,
* `"int *"` etc).
*
* Thin wrapper around `cuda::std::__pretty_nameof<T>()` returning `::std::string_view`.
*
* @tparam T The type to show.
*
* @snippet unittest.h type_name
*/
template <class T>
inline constexpr ::std::string_view type_name = reserved::type_name_impl<T>();
inline const ::std::string_view type_name{
::cuda::std::__pretty_nameof<T>().data(), ::cuda::std::__pretty_nameof<T>().size()};

/**
* @brief Converts each element in `t` to a new value by calling `f`, then returns a tuple collecting the values thus
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