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Use explicit form of common_type_t to work around CUDA 10.1 nvcc issue #82
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Fixes issue compiling with CUDA 10.1 nvcc (example here).
Click to expand stack trace
cuda/std/detail/libcxx/include/chrono:3121:60: error: expansion pattern ‘_Duration’ contains no argument packs using precision = duration<typename __CommonType::rep, ratio<1, __pow10(fractional_width)>>; ^~~ cuda/std/detail/libcxx/include/chrono:3121:99: error: template argument 1 is invalid using precision = duration<typename __CommonType::rep, ratio<1, __pow10(fractional_width)>>; cuda/std/detail/libcxx/include/chrono:3121:107: error: expected template-argument before ‘::’ token using precision = duration<typename __CommonType::rep, ratio<1, __pow10(fractional_width)>>; cuda/std/detail/libcxx/include/chrono:3121:107: error: expected ‘>’ before ‘::’ token cuda/std/detail/libcxx/include/chrono:3121:185: error: template argument 1 is invalid using precision = duration<typename __CommonType::rep, ratio<1, __pow10(fractional_width)>>; cuda/std/detail/libcxx/include/chrono:3144:11: error: ‘precision’ does not name a type constexpr precision subseconds() const noexcept { return __f; } ^~~~~~~~~ cuda/std/detail/libcxx/include/chrono:3147:11: error: ‘precision’ does not name a type constexpr precision to_duration() const noexcept ^~~~~~~~~ cuda/std/detail/libcxx/include/chrono:3154:29: error: expected type-specifier before ‘precision’ constexpr explicit operator precision() const noexcept { return to_duration(); } ^~~~~~~~~ cuda/std/detail/libcxx/include/chrono:3161:1: error: ‘precision’ does not name a type precision __f; ^ ~~~~~ cuda/std/detail/libcxx/include/chrono: In constructor ‘constexpr cuda::std::__3::chrono::hh_mm_ss<_Duration>::hh_mm_ss(_Duration)’: cuda/std/detail/libcxx/include/chrono:3127:266: error: class ‘cuda::std::__3::chrono::hh_mm_ss<_Duration>’ does not have any field named ‘__f’ constexpr explicit hh_mm_ss(_Duration __d) noexcept : cuda/std/detail/libcxx/include/chrono:3127:285: error: ‘precision’ was not declared in this scope constexpr explicit hh_mm_ss(_Duration __d) noexcept :