triqs::gfs::bgf_expr< Tag, L, R >

#include <triqs/gfs/block/expr.hpp>

Detailed Description

template<typename Tag, typename L, typename R>
struct triqs::gfs::bgf_expr< Tag, L, R >

Lazy expression node representing a binary operation between two block Green's function operands.

Models the BlockGreenFunction concept, so expressions can be nested and assigned to a triqs::gfs::block_gf. The mesh and target are deduced from the operands and the operation is evaluated lazily, block by block, on access.

Template Parameters

Tag	Operation tag (+, -, *, /).
L	Type of the left operand (a block Green's function or a wrapped scalar).
R	Type of the right operand (a block Green's function or a wrapped scalar).

Definition at line 106 of file expr.hpp.

Public Types
using	L_t = std::decay_t<L>
	Decayed type of the left operand.
using	mesh_t = typename details_bgfs_expr::same_or_void<typename L_t::mesh_t, typename R_t::mesh_t>::type
	Mesh type of the expression, deduced from the two operands.
using	R_t = std::decay_t<R>
	Decayed type of the right operand.
using	target_t = typename details_bgfs_expr::same_or_void<typename L_t::target_t, typename R_t::target_t>::type
	Target type of the expression, deduced from the two operands.

Public Member Functions
template<typename LL, typename RR>
	bgf_expr (LL &&l_, RR &&r_)
	Construct from the two operands.
auto	block_names () const
	Get the block names of the expression.
template<typename... Args>
decltype(auto)	operator() (Args &&...1) const
	Evaluate the expression via call at the given arguments.
template<typename... Keys>
decltype(auto)	operator[] (Keys &&...keys) const
	Evaluate the expression via subscript at the given keys.
auto	size () const
	Get the number of blocks of the expression.
auto	size1 () const
	Get the number of blocks along the first dimension (for a block2 expression).
auto	size2 () const
	Get the number of blocks along the second dimension (for a block2 expression).

Public Attributes
L	l
	Left operand.
R	r
	Right operand.

Static Public Attributes
static constexpr int	arity = std::max(arity_of<L_t>, arity_of<R_t>)
	Block arity of the expression (1 for triqs::gfs::block_gf, 2 for triqs::gfs::block2_gf).

Friends
std::ostream &	operator<< (std::ostream &sout, bgf_expr const &expr)
	Stream output of the expression.

Constructor & Destructor Documentation

bgf_expr()

template<typename Tag, typename L, typename R>

template<typename LL, typename RR>

triqs::gfs::bgf_expr< Tag, L, R >::bgf_expr ( LL && l_, RR && r_ )

inline

Construct from the two operands.

Template Parameters

LL	Forwarding type of the left operand.
RR	Forwarding type of the right operand.

Parameters

l_	Left operand.
r_	Right operand.

Definition at line 141 of file expr.hpp.

Member Function Documentation

block_names()

template<typename Tag, typename L, typename R>

auto triqs::gfs::bgf_expr< Tag, L, R >::block_names ( ) const

inline

Get the block names of the expression.

Returns

The block names taken from the block Green's function operand.

Definition at line 165 of file expr.hpp.

operator()()

template<typename Tag, typename L, typename R>

template<typename... Args>

decltype(auto) triqs::gfs::bgf_expr< Tag, L, R >::operator() ( Args &&... 1 ) const

inline

Evaluate the expression via call at the given arguments.

Template Parameters

Args	Types of the evaluation arguments.

Returns

The result of applying the operation to the operands' evaluated values.

Definition at line 189 of file expr.hpp.

operator[]()

template<typename Tag, typename L, typename R>

template<typename... Keys>

decltype(auto) triqs::gfs::bgf_expr< Tag, L, R >::operator[] ( Keys &&... keys ) const

inline

Evaluate the expression via subscript at the given keys.

Template Parameters

Keys	Types of the access keys.

Parameters

keys	Block indices.

Returns

The result of applying the operation to the operands' subscripted values.

Definition at line 179 of file expr.hpp.

size()

template<typename Tag, typename L, typename R>

auto triqs::gfs::bgf_expr< Tag, L, R >::size ( ) const

inline

Get the number of blocks of the expression.

Returns

The larger block count of the two operands.

Definition at line 147 of file expr.hpp.

size1()

template<typename Tag, typename L, typename R>

auto triqs::gfs::bgf_expr< Tag, L, R >::size1 ( ) const

inline

Get the number of blocks along the first dimension (for a block2 expression).

Returns

The larger first-dimension block count of the two operands.

Definition at line 153 of file expr.hpp.

size2()

template<typename Tag, typename L, typename R>

auto triqs::gfs::bgf_expr< Tag, L, R >::size2 ( ) const

inline

Get the number of blocks along the second dimension (for a block2 expression).

Returns

The larger second-dimension block count of the two operands.

Definition at line 159 of file expr.hpp.

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The documentation for this struct was generated from the following file:

• triqs/gfs/block/expr.hpp