slp::detail::SignExpression Struct Reference

Derived expression type for sign(). More...

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

Inheritance diagram for slp::detail::SignExpression:

Public Member Functions
constexpr	SignExpression (ExpressionPtr lhs)
	Constructs an unary expression (an operator with one argument).
double	value (double x, 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).
double	grad_l (double, double, double) const override
	Returns double adjoint of the left child expression.
ExpressionPtr	grad_expr_l (const ExpressionPtr &, const ExpressionPtr &, const ExpressionPtr &) const override
	Returns Expression adjoint of the left child expression.
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_r (double lhs, double rhs, double parent_adjoint) const
	Returns double adjoint of the right 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 sign().

Constructor & Destructor Documentation

SignExpression()

slp::detail::SignExpression::SignExpression ( ExpressionPtr lhs )

inlineexplicitconstexpr

Constructs an unary expression (an operator with one argument).

Parameters

lhs	Unary operator's operand.

Member Function Documentation

grad_expr_l()

ExpressionPtr slp::detail::SignExpression::grad_expr_l ( const ExpressionPtr & lhs, const ExpressionPtr & rhs, const ExpressionPtr & parent_adjoint ) const

inlineoverridevirtual

Returns Expression adjoint of the left child expression.

Parameters

lhs	Left argument to binary operator.
rhs	Right argument to binary operator.
parent_adjoint	Adjoint of parent expression.

Returns

The Expression adjoint of the left child expression.

Reimplemented from slp::detail::Expression.

grad_l()

double slp::detail::SignExpression::grad_l ( double lhs, double rhs, double parent_adjoint ) const

inlineoverridevirtual

Returns double adjoint of the left child expression.

Parameters

lhs	Left argument to binary operator.
rhs	Right argument to binary operator.
parent_adjoint	Adjoint of parent expression.

Returns

The double adjoint of the left child expression.

Reimplemented from slp::detail::Expression.

type()

ExpressionType slp::detail::SignExpression::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::SignExpression::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.

Parameters

lhs	Left argument to binary operator.
rhs	Right argument to binary operator.

Returns

The node's value.

Implements slp::detail::Expression.

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

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