cuda::uabs
template <typename T>
[[nodiscard]] __host__ __device__ inline constexpr
cuda::std::make_unsigned_t<T> uabs(T value) noexcept;
The function computes the absolute value of the input value. The result is returned as an unsigned integer type of the same size as the input value. In comparison to the standard abs function, the uabs eliminates the undefined behaviour when a signed T_MIN is passed as an input.
Parameters
value: The input value.
Return value
The unsigned absolute value of the input value.
Constraints
Tis an integer type.
Example
#include <cuda/cmath>
#include <cuda/std/cassert>
#include <cuda/std/limits>
__global__ void uabs_kernel() {
using cuda::std::numeric_limits;
assert(cuda::uabs(20) == 20u);
assert(cuda::uabs(-32) == 32u);
assert(cuda::uabs(numeric_limits<int>::max()) == static_cast<unsigned>(numeric_limits<int>::max()));
assert(cuda::uabs(numeric_limits<int>::min()) == static_cast<unsigned>(numeric_limits<int>::max()) + 1);
}
int main() {
uabs_kernel<<<1, 1>>>();
cudaDeviceSynchronize();
return 0;
}