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Showing content from https://cplusplus.github.io/LWG/issue4137 below:

Fix Mandates, Preconditions, and Complexity elements of [linalg] algorithms

template<in-matrix InMat, class Triangle, class DiagonalStorage, in-vector InVec,
         out-vector OutVec>
  void triangular_matrix_vector_product(InMat A, Triangle t, DiagonalStorage d, InVec x, OutVec y);
template<class ExecutionPolicy,
         in-matrix InMat, class Triangle, class DiagonalStorage, in-vector InVec,
         out-vector OutVec>
  void triangular_matrix_vector_product(ExecutionPolicy&& exec,
                                        InMat A, Triangle t, DiagonalStorage d, InVec x, OutVec y);

-5- […]

-6- Effects: Computes y = Ax . -5- Complexity: 𝒪( A x.extent(0) × x A.extent( 0 1)).

template<in-matrix InMat, class Triangle, class DiagonalStorage, inout-vector InOutVec>
  void triangular_matrix_vector_product(InMat A, Triangle t, DiagonalStorage d, InOutVec y);
template<class ExecutionPolicy,
         in-matrix InMat, class Triangle, class DiagonalStorage, inout-vector InOutVec>
  void triangular_matrix_vector_product(ExecutionPolicy&& exec,
                                        InMat A, Triangle t, DiagonalStorage d, InOutVec y);

-8- […]

-9- Effects: […] -10- Complexity: 𝒪( A y.extent(0) × y A.extent( 0 1)).

template<in-matrix InMat, class Triangle, class DiagonalStorage, 
         in-vector InVec1, in-vector InVec2, out-vector OutVec>
  void triangular_matrix_vector_product(InMat A, Triangle t, DiagonalStorage d,
                                        InVec1 x, InVec2 y, OutVec z);
template<class ExecutionPolicy,
         in-matrix InMat, class Triangle, class DiagonalStorage, 
         in-vector InVec1, in-vector InVec2, out-vector OutVec>
  void triangular_matrix_vector_product(ExecutionPolicy&& exec,
                                        InMat A, Triangle t, DiagonalStorage d,
                                        InVec1 x, InVec2 y, OutVec z);

-11- […]

-12- Effects: Computes z = y + Ax . -13- Complexity: 𝒪( A x.extent(0) × x A.extent( 0 1)).

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