fix formatting and replace C-style comment with [[maybe_unused]]

Author: ericniebler

examples/nvexec/maxwell/common.cuh

@@ -366,7 +366,7 @@ class result_dumper_t {
     , accessor_(accessor) {
   }
 
-  void operator()(bool /* update_time */ = true) const {
+  void operator()([[maybe_unused]] bool update_time = true) const {
     int rank_ = 0;
     const std::string filename = std::string("output_") + std::to_string(rank_) + "_"
                                + std::to_string(0) + ".vtk";

examples/nvexec/maxwell/stdpar.cuh

@@ -32,7 +32,7 @@
 #include <thrust/iterator/counting_iterator.h>
 
 template <class Policy>
-auto is_gpu_policy([[maybe_unused]]Policy&& policy) -> bool {
+auto is_gpu_policy([[maybe_unused]] Policy&& policy) -> bool {
 #if defined(_NVHPC_CUDA) || defined(__CUDACC__)
   bool* flag{};
   STDEXEC_TRY_CUDA_API(cudaMallocHost(&flag, sizeof(bool)));

include/nvexec/detail/throw_on_cuda_error.cuh

@@ -65,7 +65,7 @@ namespace nvexec::detail {
   }
 
   [[nodiscard]]
-  inline auto log_on_cuda_error(cudaError_t status, [[maybe_unused]]char const * const file_name, [[maybe_unused]]const int line) noexcept
+  inline auto log_on_cuda_error(cudaError_t status, [[maybe_unused]] char const *const file_name, [[maybe_unused]] const int line) noexcept
     -> ::cudaError_t {
     // Clear the global CUDA error state which may have been set by the last
     // call. Otherwise, errors may "leak" to unrelated calls.