Derived expression type for constant. More...

#include </home/runner/work/allwpilib/allwpilib/wpimath/src/main/native/thirdparty/sleipnir/include/sleipnir/autodiff/expression.hpp>

Inheritance diagram for slp::detail::ConstExpression:

Public Member Functions
constexpr	ConstExpression ()=default
	Constructs a constant expression with a value of zero.

constexpr	ConstExpression (double value)
	Constructs a nullary expression (an operator with no arguments).

double	value (double, double) const override
	Either nullary operator with no arguments, unary operator with one argument, or binary operator with two arguments.

ExpressionType	type () const override
	Returns the type of this expression (constant, linear, quadratic, or nonlinear).

Public Member Functions inherited from slp::detail::Expression
constexpr	Expression ()=default
	Constructs a constant expression with a value of zero.

constexpr	Expression (double value)
	Constructs a nullary expression (an operator with no arguments).

constexpr	Expression (ExpressionPtr lhs)
	Constructs an unary expression (an operator with one argument).

constexpr	Expression (ExpressionPtr lhs, ExpressionPtr rhs)
	Constructs a binary expression (an operator with two arguments).

virtual	~Expression ()=default

constexpr bool	is_constant (double constant) const
	Returns true if the expression is the given constant.

virtual double	grad_l (double lhs, double rhs, double parent_adjoint) const
	Returns double adjoint of the left child expression.

virtual double	grad_r (double lhs, double rhs, double parent_adjoint) const
	Returns double adjoint of the right child expression.

virtual ExpressionPtr	grad_expr_l (const ExpressionPtr &lhs, const ExpressionPtr &rhs, const ExpressionPtr &parent_adjoint) const
	Returns Expression adjoint of the left child expression.

virtual ExpressionPtr	grad_expr_r (const ExpressionPtr &lhs, const ExpressionPtr &rhs, const ExpressionPtr &parent_adjoint) const
	Returns Expression adjoint of the right child expression.

Additional Inherited Members
Public Attributes inherited from slp::detail::Expression
double	val = 0.0
	The value of the expression node.

double	adjoint = 0.0
	The adjoint of the expression node used during autodiff.

uint32_t	incoming_edges = 0
	Counts incoming edges for this node.

int32_t	col = -1
	This expression's column in a Jacobian, or -1 otherwise.

ExpressionPtr	adjoint_expr
	The adjoint of the expression node used during gradient expression tree generation.

uint32_t	ref_count = 0
	Reference count for intrusive shared pointer.

std::array< ExpressionPtr, 2 >	args {nullptr, nullptr}
	Expression arguments.

Detailed Description

Derived expression type for constant.

Constructor & Destructor Documentation

◆ ConstExpression() [1/2]

slp::detail::ConstExpression::ConstExpression ( )

constexprdefault

Constructs a constant expression with a value of zero.

◆ ConstExpression() [2/2]

slp::detail::ConstExpression::ConstExpression ( double value )

inlineexplicitconstexpr

Constructs a nullary expression (an operator with no arguments).

Parameters

value The expression value.

Member Function Documentation

◆ type()

ExpressionType slp::detail::ConstExpression::type ( ) const

inlineoverridevirtual

Returns the type of this expression (constant, linear, quadratic, or nonlinear).

Returns: The type of this expression.

Implements slp::detail::Expression.

◆ value()

double slp::detail::ConstExpression::value	(	double	lhs,
		double	rhs ) const

inlineoverridevirtual

Either nullary operator with no arguments, unary operator with one argument, or binary operator with two arguments.

This operator is used to update the node's value.