#include <triqs/gfs/gf_sym_grp.hpp>

Detailed Description

Symmetry concept for tensor-valued Green's functions.

A TensorGfSymmetry accepts a mesh index and a target index and returns a new mesh index, a new target index and the residual nda::operation to be applied to the data.

Template Parameters

F	Anything callable with a mesh_index_t and a target_index_t.
G	Anything modeling the gf concept (with target_rank > 0).
mesh_index_t	Mesh index type for G.
target_index_t	Target index type for G.

Definition at line 76 of file gf_sym_grp.hpp.

Concept definition

template<typename F, typename G, typename mesh_index_t typename G::mesh_t::index_t, typename target_index_t std::array<long, static_cast<std::size_t>(G::target_rank)>>
concept triqs::gfs::TensorGfSymmetry =  is_gf_v<G> and 
     requires(F f, mesh_index_t const &mesh_index, target_index_t const &target_index) {
       requires(G::target_rank > 0);
       { f(mesh_index, target_index) } -> std::same_as<std::tuple<mesh_index_t, target_index_t, nda::operation>>;
     }