Implement `operator<<` for `cuda::std::string_view` #4736

davebayer · 2025-05-19T09:01:41Z

This PR implements operator<< for cuda::std::string_view. This is the final piece of <cuda/std/string_view> implementation, so I've also updated the version macro.

copy-pr-bot · 2025-05-19T09:01:45Z

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davebayer · 2025-05-19T09:02:30Z

libcudacxx/include/cuda/std/__string/helper_functions.h


+_CCCL_EXEC_CHECK_DISABLE
 template <class _CharT, class _SizeT, class _Traits, _SizeT __npos>


Adding _CCCL_EXEC_CHECK_DISABLE is necessary to allow using e. g. host only char_traits

I am a bit torn here, we should use host only char_traits as they will crash.

I believe the solution with just casting to ::std::string_view is the better solution

The problem is that the user can pass any type traits he wants, they might be host only, or device only..

davebayer · 2025-05-19T09:04:23Z

libcudacxx/include/cuda/std/string_view

 template <class _CharT, class _Traits>
-_LIBCUDACXX_HIDE_FROM_ABI ::std::basic_ostream<_CharT, _Traits>&
+_CCCL_HIDE_FROM_ABI _CCCL_HOST ::std::basic_ostream<_CharT, _Traits>&
 operator<<(::std::basic_ostream<_CharT, _Traits>& __os, basic_string_view<_CharT, _Traits> __str)
 {
-  return __os.write(__str.data(), static_cast<::std::streamsize>(__str.size()));
+  return __os << ::std::basic_string_view<_CharT, _Traits>{__str.data(), __str.size()};
+}
+
+template <class _CharT>
+_CCCL_HIDE_FROM_ABI _CCCL_HOST ::std::basic_ostream<_CharT, ::std::char_traits<_CharT>>& operator<<(
+  ::std::basic_ostream<_CharT, ::std::char_traits<_CharT>>& __os, basic_string_view<_CharT, char_traits<_CharT>> __str)
+{
+  return __os << ::std::basic_string_view<_CharT, ::std::char_traits<_CharT>>{__str.data(), __str.size()};
 }


I've had to split the implementation to map the cuda::std::char_traits to std::char_traits

miscco · 2025-05-19T09:08:14Z

libcudacxx/include/cuda/std/__string/helper_functions.h


+_CCCL_EXEC_CHECK_DISABLE
 template <class _CharT, class _SizeT, class _Traits, _SizeT __npos>


I am a bit torn here, we should use host only char_traits as they will crash.

I believe the solution with just casting to ::std::string_view is the better solution

libcudacxx/include/cuda/std/string_view

miscco · 2025-05-19T11:00:56Z

libcudacxx/include/cuda/std/string_view

@@ -147,6 +147,21 @@ public:
      , __size_{_CUDA_VRANGES::size(__r)}
  {}

+#if !_CCCL_COMPILER(NVRTC)
+  _CCCL_HIDE_FROM_ABI constexpr basic_string_view(::std::basic_string_view<_CharT, _Traits> __sv) noexcept


This forces use of the same char_traits than this string_view is using. We should templatize this so that we can construct from a ::std::string_view

This is intentional, the idea is that both char traits types must match with an exception of std::char_traits that are mapped to cuda::std::char_traits. That means that:

cuda::std::basic_string_view<CharT, cuda::std::char_traits<CharT>> can be constructed (converted) from (to) both std::basic_string_view<CharT, std::char_traits<CharT>> and std::basic_string_view<CharT, cuda::std::char_traits<CharT>>

cuda::std::basic_string_view<CharT, Traits> can be constructed (converted) from (to) std::basic_string_view<CharT, Traits>

Do you think this is wrong?

I believe then should have 2 constructors,

basic_string_view(::std::basic_string_view<_CharT, _Traits> __sv)

basic_string_view(::std::basic_string_view<_CharT, ::std::char_traits<_CharT>> __sv)

We can then omit the constraint on the second constructor

That's what we have now. But I don't think we can omit the constraint, because we must ensure that the current type traits are cuda::std::char_traits, otherwise we would allow something like:

cuda::std::basic_string_view<my_char, my_char_traits>{std::basic_string_view<my_char, std::char_traits<my_char>>{...}};

which is wrong

I dont think so, the incoming type traits are correct and its the users responsibility to ensure that their char_traits are conforming.

Also no one writes their own char_traits, so I believe its more of a theoretical question

libcudacxx/include/cuda/std/string_view

miscco · 2025-05-20T08:22:24Z

/ok to test 576a28c

miscco · 2025-05-20T08:38:03Z

/ok to test 12ebede

miscco · 2025-05-20T08:57:00Z

/ok to test d8346ae

miscco · 2025-05-20T11:38:15Z

/ok to test 2974a4f

github-actions · 2025-05-20T16:18:41Z

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  🟩 NVHPC25.3          Pass: 100%/2   | Total: 59m 29s | Avg: 29m 44s | Max: 30m 53s | Hits:  99%/3578  
🟩 cxx_family
  🟩 Clang              Pass: 100%/19  | Total:  2h 05m | Avg:  6m 37s | Max: 14m 44s | Hits:  99%/33991 
  🟩 GCC                Pass: 100%/21  | Total:  3h 03m | Avg:  8m 44s | Max: 17m 15s | Hits:  99%/37590 
  🟩 MSVC               Pass: 100%/5   | Total:  2h 36m | Avg: 31m 23s | Max: 34m 40s | Hits:  99%/8915  
  🟩 NVHPC              Pass: 100%/2   | Total: 59m 29s | Avg: 29m 44s | Max: 30m 53s | Hits:  99%/3578  
🟩 gpu
  🟩 h100               Pass: 100%/2   | Total: 20m 49s | Avg: 10m 24s | Max: 14m 53s | Hits:  99%/3580  
  🟩 rtx2080            Pass: 100%/35  | Total:  5h 47m | Avg:  9m 56s | Max: 31m 01s | Hits:  99%/62611 
  🟩 rtx4090            Pass: 100%/10  | Total:  2h 37m | Avg: 15m 45s | Max: 34m 40s | Hits:  99%/17883 
🟩 jobs
  🟩 Build              Pass: 100%/40  | Total:  6h 50m | Avg: 10m 15s | Max: 33m 24s | Hits:  99%/71553 
  🟩 TestCPU            Pass: 100%/3   | Total: 52m 38s | Avg: 17m 32s | Max: 34m 40s | Hits:  99%/5362  
  🟩 TestGPU            Pass: 100%/4   | Total:  1h 03m | Avg: 15m 47s | Max: 17m 15s | Hits:  99%/7159  
🟩 sm
  🟩 90                 Pass: 100%/2   | Total: 20m 49s | Avg: 10m 24s | Max: 14m 53s | Hits:  99%/3580  
  🟩 90;90a;100         Pass: 100%/1   | Total:  7m 37s | Avg:  7m 37s | Max:  7m 37s | Hits:  99%/1790  
🟩 std
  🟩 17                 Pass: 100%/21  | Total:  3h 54m | Avg: 11m 11s | Max: 31m 01s | Hits:  99%/37560 
  🟩 20                 Pass: 100%/24  | Total:  4h 26m | Avg: 11m 06s | Max: 34m 40s | Hits:  99%/42934

🟩 cudax: Pass: 100%/26 | Total: 2h 25m | Avg: 5m 35s | Max: 13m 41s | Hits: 99%/14850

🟩 cpu
  🟩 amd64              Pass: 100%/22  | Total:  2h 11m | Avg:  5m 57s | Max: 13m 41s | Hits:  99%/12474 
  🟩 arm64              Pass: 100%/4   | Total: 14m 15s | Avg:  3m 33s | Max:  3m 49s | Hits:  99%/2376  
🟩 ctk
  🟩 12.0               Pass: 100%/3   | Total: 20m 41s | Avg:  6m 53s | Max: 13m 41s | Hits:  98%/1487  
  🟩 12.8               Pass: 100%/23  | Total:  2h 04m | Avg:  5m 25s | Max: 12m 59s | Hits:  99%/13363 
🟩 cudacxx
  🟩 nvcc12.0           Pass: 100%/3   | Total: 20m 41s | Avg:  6m 53s | Max: 13m 41s | Hits:  98%/1487  
  🟩 nvcc12.8           Pass: 100%/23  | Total:  2h 04m | Avg:  5m 25s | Max: 12m 59s | Hits:  99%/13363 
🟩 cudacxx_family
  🟩 nvcc               Pass: 100%/26  | Total:  2h 25m | Avg:  5m 35s | Max: 13m 41s | Hits:  99%/14850 
🟩 cxx
  🟩 Clang14            Pass: 100%/2   | Total:  7m 16s | Avg:  3m 38s | Max:  3m 55s | Hits: 100%/1192  
  🟩 Clang15            Pass: 100%/1   | Total:  3m 58s | Avg:  3m 58s | Max:  3m 58s | Hits: 100%/594   
  🟩 Clang16            Pass: 100%/1   | Total:  4m 04s | Avg:  4m 04s | Max:  4m 04s | Hits: 100%/594   
  🟩 Clang17            Pass: 100%/1   | Total:  4m 04s | Avg:  4m 04s | Max:  4m 04s | Hits: 100%/594   
  🟩 Clang18            Pass: 100%/1   | Total:  3m 53s | Avg:  3m 53s | Max:  3m 53s | Hits: 100%/594   
  🟩 Clang19            Pass: 100%/4   | Total: 18m 53s | Avg:  4m 43s | Max:  8m 30s | Hits: 100%/2376  
  🟩 GCC10              Pass: 100%/2   | Total:  7m 35s | Avg:  3m 47s | Max:  3m 56s | Hits:  99%/1192  
  🟩 GCC11              Pass: 100%/1   | Total:  4m 08s | Avg:  4m 08s | Max:  4m 08s | Hits:  99%/594   
  🟩 GCC12              Pass: 100%/1   | Total:  4m 26s | Avg:  4m 26s | Max:  4m 26s | Hits:  99%/594   
  🟩 GCC13              Pass: 100%/8   | Total: 42m 34s | Avg:  5m 19s | Max: 10m 28s | Hits:  99%/4752  
  🟩 MSVC14.39          Pass: 100%/1   | Total: 13m 41s | Avg: 13m 41s | Max: 13m 41s | Hits:  95%/295   
  🟩 MSVC14.42          Pass: 100%/1   | Total: 12m 59s | Avg: 12m 59s | Max: 12m 59s | Hits:  95%/295   
  🟩 NVHPC25.3          Pass: 100%/2   | Total: 17m 54s | Avg:  8m 57s | Max:  9m 11s | Hits:  97%/1184  
🟩 cxx_family
  🟩 Clang              Pass: 100%/10  | Total: 42m 08s | Avg:  4m 12s | Max:  8m 30s | Hits: 100%/5944  
  🟩 GCC                Pass: 100%/12  | Total: 58m 43s | Avg:  4m 53s | Max: 10m 28s | Hits:  99%/7132  
  🟩 MSVC               Pass: 100%/2   | Total: 26m 40s | Avg: 13m 20s | Max: 13m 41s | Hits:  95%/590   
  🟩 NVHPC              Pass: 100%/2   | Total: 17m 54s | Avg:  8m 57s | Max:  9m 11s | Hits:  97%/1184  
🟩 gpu
  🟩 h100               Pass: 100%/2   | Total: 12m 14s | Avg:  6m 07s | Max:  8m 37s | Hits:  99%/1188  
  🟩 rtx2080            Pass: 100%/24  | Total:  2h 13m | Avg:  5m 32s | Max: 13m 41s | Hits:  99%/13662 
🟩 jobs
  🟩 Build              Pass: 100%/23  | Total:  1h 57m | Avg:  5m 07s | Max: 13m 41s | Hits:  99%/13068 
  🟩 Test               Pass: 100%/3   | Total: 27m 35s | Avg:  9m 11s | Max: 10m 28s | Hits:  99%/1782  
🟩 sm
  🟩 90                 Pass: 100%/3   | Total: 16m 00s | Avg:  5m 20s | Max:  8m 37s | Hits:  99%/1782  
  🟩 90a                Pass: 100%/1   | Total:  3m 43s | Avg:  3m 43s | Max:  3m 43s | Hits:  99%/594   
🟩 std
  🟩 17                 Pass: 100%/4   | Total: 19m 39s | Avg:  4m 54s | Max:  8m 43s | Hits:  99%/2374  
  🟩 20                 Pass: 100%/22  | Total:  2h 05m | Avg:  5m 43s | Max: 13m 41s | Hits:  99%/12476

🟩 stdpar: Pass: 100%/4 | Total: 19m 27s | Avg: 4m 51s | Max: 5m 34s

🟩 cpu
  🟩 amd64              Pass: 100%/2   | Total: 10m 50s | Avg:  5m 25s | Max:  5m 34s
  🟩 arm64              Pass: 100%/2   | Total:  8m 37s | Avg:  4m 18s | Max:  4m 23s
🟩 ctk
  🟩 12.8               Pass: 100%/4   | Total: 19m 27s | Avg:  4m 51s | Max:  5m 34s
🟩 cudacxx
  🟩 nvcc12.8           Pass: 100%/4   | Total: 19m 27s | Avg:  4m 51s | Max:  5m 34s
🟩 cudacxx_family
  🟩 nvcc               Pass: 100%/4   | Total: 19m 27s | Avg:  4m 51s | Max:  5m 34s
🟩 cxx
  🟩 NVHPC25.3          Pass: 100%/4   | Total: 19m 27s | Avg:  4m 51s | Max:  5m 34s
🟩 cxx_family
  🟩 NVHPC              Pass: 100%/4   | Total: 19m 27s | Avg:  4m 51s | Max:  5m 34s
🟩 gpu
  🟩 rtx2080            Pass: 100%/4   | Total: 19m 27s | Avg:  4m 51s | Max:  5m 34s
🟩 jobs
  🟩 Build              Pass: 100%/4   | Total: 19m 27s | Avg:  4m 51s | Max:  5m 34s
🟩 std
  🟩 17                 Pass: 100%/2   | Total:  9m 39s | Avg:  4m 49s | Max:  5m 16s
  🟩 20                 Pass: 100%/2   | Total:  9m 48s | Avg:  4m 54s | Max:  5m 34s

🟩 cccl_c_parallel: Pass: 100%/2 | Total: 15m 38s | Avg: 7m 49s | Max: 13m 07s | Hits: 98%/328

🟩 cpu
  🟩 amd64              Pass: 100%/2   | Total: 15m 38s | Avg:  7m 49s | Max: 13m 07s | Hits:  98%/328   
🟩 ctk
  🟩 12.8               Pass: 100%/2   | Total: 15m 38s | Avg:  7m 49s | Max: 13m 07s | Hits:  98%/328   
🟩 cudacxx
  🟩 nvcc12.8           Pass: 100%/2   | Total: 15m 38s | Avg:  7m 49s | Max: 13m 07s | Hits:  98%/328   
🟩 cudacxx_family
  🟩 nvcc               Pass: 100%/2   | Total: 15m 38s | Avg:  7m 49s | Max: 13m 07s | Hits:  98%/328   
🟩 cxx
  🟩 GCC13              Pass: 100%/2   | Total: 15m 38s | Avg:  7m 49s | Max: 13m 07s | Hits:  98%/328   
🟩 cxx_family
  🟩 GCC                Pass: 100%/2   | Total: 15m 38s | Avg:  7m 49s | Max: 13m 07s | Hits:  98%/328   
🟩 gpu
  🟩 rtx2080            Pass: 100%/2   | Total: 15m 38s | Avg:  7m 49s | Max: 13m 07s | Hits:  98%/328   
🟩 jobs
  🟩 Build              Pass: 100%/1   | Total:  2m 31s | Avg:  2m 31s | Max:  2m 31s | Hits:  98%/164   
  🟩 Test               Pass: 100%/1   | Total: 13m 07s | Avg: 13m 07s | Max: 13m 07s | Hits:  98%/164

👃 Inspect Changes

Modifications in project?

	Project
	CCCL Infrastructure
+/-	libcu++
	CUB
	Thrust
	CUDA Experimental
	stdpar
	python
	CCCL C Parallel Library
	Catch2Helper

Modifications in project or dependencies?

	Project
	CCCL Infrastructure
+/-	libcu++
+/-	CUB
+/-	Thrust
+/-	CUDA Experimental
+/-	stdpar
+/-	python
+/-	CCCL C Parallel Library
+/-	Catch2Helper

🏃‍ Runner counts (total jobs: 183)

#	Runner
129	`linux-amd64-cpu16`
15	`windows-amd64-cpu16`
12	`linux-arm64-cpu16`
12	`linux-amd64-gpu-rtxa6000-latest-1`
7	`linux-amd64-gpu-rtx2080-latest-1`
5	`linux-amd64-gpu-h100-latest-1`
3	`linux-amd64-gpu-rtx4090-latest-1`

Implement operator<< for cuda::std::string_view

275c887

davebayer requested a review from a team as a code owner May 19, 2025 09:01

davebayer requested a review from wmaxey May 19, 2025 09:01

github-project-automation bot added this to CCCL May 19, 2025

github-project-automation bot moved this to Todo in CCCL May 19, 2025

cccl-authenticator-app bot moved this from Todo to In Review in CCCL May 19, 2025

davebayer commented May 19, 2025

View reviewed changes

miscco requested changes May 19, 2025

View reviewed changes

github-project-automation bot moved this from In Review to In Progress in CCCL May 19, 2025

add interoperability with std::string_view

545c4d9

miscco reviewed May 19, 2025

View reviewed changes

fix review, simplify implementation

576a28c

davebayer force-pushed the string_view_ostream branch from 031d5fa to 576a28c Compare May 20, 2025 07:00

fix typo

12ebede

add missing typename

d8346ae

try to fix compilation

2974a4f


		_CCCL_EXEC_CHECK_DISABLE
		template <class _CharT, class _SizeT, class _Traits, _SizeT __npos>

Implement operator<< for cuda::std::string_view #4736

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Implement operator<< for cuda::std::string_view #4736

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davebayer commented May 19, 2025

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miscco commented May 20, 2025

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miscco commented May 20, 2025

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miscco commented May 20, 2025

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github-actions bot commented May 20, 2025

🟨 libcudacxx: Pass: 86%/45 | Total: 9h 37m | Avg: 12m 49s | Max: 41m 07s | Hits: 88%/114327

🟨 python: Pass: 66%/12 | Total: 58m 22s | Avg: 4m 51s | Max: 9m 55s

🟩 cub: Pass: 100%/47 | Total: 10h 47m | Avg: 13m 46s | Max: 36m 00s | Hits: 99%/57218

🟩 thrust: Pass: 100%/47 | Total: 8h 46m | Avg: 11m 11s | Max: 34m 40s | Hits: 99%/84074

🟩 cudax: Pass: 100%/26 | Total: 2h 25m | Avg: 5m 35s | Max: 13m 41s | Hits: 99%/14850

🟩 stdpar: Pass: 100%/4 | Total: 19m 27s | Avg: 4m 51s | Max: 5m 34s

🟩 cccl_c_parallel: Pass: 100%/2 | Total: 15m 38s | Avg: 7m 49s | Max: 13m 07s | Hits: 98%/328

👃 Inspect Changes

Modifications in project?

Modifications in project or dependencies?

🏃‍ Runner counts (total jobs: 183)

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Implement `operator<<` for `cuda::std::string_view` #4736

Implement `operator<<` for `cuda::std::string_view` #4736