The lowest unit of symbolic representation. More...

#include <basic.h>

Inheritance diagram for SymEngine::Basic:

Collaboration diagram for SymEngine::Basic:

Public Member Functions
TypeID	get_type_code () const

	Basic ()
	Constructor.

	Basic (const Basic &)=delete
	Delete the copy constructor and assignment.

Basic &	operator= (const Basic &)=delete
	Assignment operator in continuation with above.

	Basic (Basic &&)=delete
	Delete the move constructor and assignment.

Basic &	operator= (Basic &&)=delete
	Assignment operator in continuation with above.

virtual hash_t	__hash__ () const =0

hash_t	hash () const

virtual bool	__eq__ (const Basic &o) const =0
	Test equality. More...

bool	__neq__ (const Basic &o) const
	true if `this` is not equal to `o`. More...

int	__cmp__ (const Basic &o) const
	Comparison operator.

virtual int	compare (const Basic &o) const =0

std::string	__str__ () const

std::string	dumps () const
	Returns a string of the instance serialized.

RCP< const Basic >	subs (const map_basic_basic &subs_dict) const
	Substitutes 'subs_dict' into 'self'.

RCP< const Basic >	xreplace (const map_basic_basic &subs_dict) const

virtual RCP< const Basic >	expand_as_exp () const
	expands the special function in terms of exp function

virtual vec_basic	get_args () const =0
	Returns the list of arguments.

virtual void	accept (Visitor &v) const =0

virtual void	accept (EvalRealDoubleVisitorFinal &v) const =0

RCP< const Basic >	diff (const RCP< const Symbol > &x, bool cache=true) const

Public Member Functions inherited from SymEngine::EnableRCPFromThis< Basic >
RCP< Basic >	rcp_from_this ()
	Get RCP<T> pointer to self (it will cast the pointer to T)

RCP< const Basic >	rcp_from_this () const
	Get RCP<const T> pointer to self (it will cast the pointer to const T)

RCP< const T2 >	rcp_from_this_cast () const
	Get RCP<T2> pointer to self (it will cast the pointer to T2)

unsigned int	use_count () const

Static Public Member Functions
static RCP< const Basic >	loads (const std::string &)
	Creates an instance of a serialized string.

Data Fields
TypeID	type_code_

Private Attributes
hash_t	hash_
	Private variables.

Detailed Description

The lowest unit of symbolic representation.

Classes like Add, Mul, Pow are initialized through their constructor using their internal representation. Add, Mul have a 'coeff' and 'dict', while Pow has 'base' and 'exp'. There are restrictions on what 'coeff' and 'dict' can be (for example 'coeff' cannot be zero in Mul, and if Mul is used inside Add, then Mul's coeff must be one, etc.). All these restrictions are checked when WITH_SYMENGINE_ASSERT is enabled inside the constructors using the is_canonical() method. That way, you don't have to worry about creating Add / Mul / Pow with wrong arguments, as it will be caught by the tests. In the Release mode no checks are done, so you can construct Add / Mul / Pow very quickly. The idea is that depending on the algorithm, you sometimes know that things are already canonical, so you simply pass it directly to the constructors of the Basic classes and you avoid expensive type checking and canonicalization. At the same time, you need to make sure that tests are still running with WITH_SYMENGINE_ASSERT enabled, so that the Basic classes are never in an inconsistent state.

Summary: always try to construct the expressions Add / Mul / Pow directly using their constructors and all the knowledge that you have for the given algorithm, that way things will be very fast. If you want slower but simpler code, you can use the add(), mul(), pow() functions that peform general and possibly slow canonicalization first.

Note

Any Basic class can be used in a "dictionary", due to the methods:

 __hash__()
 __eq__(o)

Warning: Subclasses must implement __hash__() and __eq__()

Definition at line 96 of file basic.h.

Member Function Documentation

◆ eq()

virtual bool SymEngine::Basic::__eq__ ( const Basic & o ) const

pure virtual

Test equality.

A virtual function for testing the equality of two Basic objects

Deprecated:: Use eq(const Basic &a, const Basic &b) non-member method

Parameters

o	a constant reference to object to test against

Returns: True if this is equal to o

Implemented in SymEngine::Tuple, SymEngine::Dummy, SymEngine::Symbol, SymEngine::ImageSet, SymEngine::ConditionSet, SymEngine::Complement, SymEngine::Intersection, SymEngine::Union, SymEngine::Naturals0, SymEngine::Naturals, SymEngine::Integers, SymEngine::Rationals, SymEngine::Reals, SymEngine::Complexes, SymEngine::Interval, SymEngine::FiniteSet, SymEngine::UniversalSet, SymEngine::EmptySet, SymEngine::SeriesBase< Poly, Coeff, Series >, SymEngine::SeriesBase< UExprDict, Expression, UnivariateSeries >, SymEngine::RealDouble, SymEngine::Rational, SymEngine::Pow, SymEngine::UPolyBase< Container, Poly >, SymEngine::UPolyBase< Cont, Poly >, SymEngine::MSymEnginePoly< Container, Poly >, SymEngine::MSymEnginePoly< MIntDict, MIntPoly >, SymEngine::MSymEnginePoly< MExprDict, MExprPoly >, SymEngine::NaN, SymEngine::Mul, SymEngine::ZeroMatrix, SymEngine::Transpose, SymEngine::Trace, SymEngine::MatrixSymbol, SymEngine::MatrixMul, SymEngine::MatrixAdd, SymEngine::ImmutableDenseMatrix, SymEngine::IdentityMatrix, SymEngine::HadamardProduct, SymEngine::DiagonalMatrix, SymEngine::ConjugateMatrix, SymEngine::Xor, SymEngine::Not, SymEngine::Or, SymEngine::And, SymEngine::Piecewise, SymEngine::Contains, SymEngine::BooleanAtom, SymEngine::Integer, SymEngine::Infty, SymEngine::Subs, SymEngine::Derivative, SymEngine::FunctionSymbol, SymEngine::MultiArgFunction, SymEngine::TwoArgBasic< Boolean >, SymEngine::OneArgFunction, SymEngine::Constant, SymEngine::ComplexDouble, SymEngine::Complex, and SymEngine::Add.

◆ hash()

virtual hash_t SymEngine::Basic::__hash__ ( ) const

pure virtual

Calculates the hash of the given SymEngine class. Use Basic.hash() which gives a cached version of the hash.

Returns: 64-bit integer value for the hash

Implemented in SymEngine::UPolyBase< Container, Poly >, SymEngine::UPolyBase< Cont, Poly >, SymEngine::Tuple, SymEngine::Dummy, SymEngine::Symbol, SymEngine::ImageSet, SymEngine::ConditionSet, SymEngine::Complement, SymEngine::Intersection, SymEngine::Union, SymEngine::Naturals0, SymEngine::Naturals, SymEngine::Integers, SymEngine::Rationals, SymEngine::Reals, SymEngine::Complexes, SymEngine::Interval, SymEngine::FiniteSet, SymEngine::UniversalSet, SymEngine::EmptySet, SymEngine::UnivariateSeries, SymEngine::RealDouble, SymEngine::Rational, SymEngine::Pow, SymEngine::URatPoly, SymEngine::UIntPoly, SymEngine::UExprPoly, SymEngine::MExprPoly, SymEngine::MIntPoly, SymEngine::NaN, SymEngine::Mul, SymEngine::ZeroMatrix, SymEngine::Transpose, SymEngine::Trace, SymEngine::MatrixSymbol, SymEngine::MatrixMul, SymEngine::MatrixAdd, SymEngine::ImmutableDenseMatrix, SymEngine::IdentityMatrix, SymEngine::HadamardProduct, SymEngine::DiagonalMatrix, SymEngine::ConjugateMatrix, SymEngine::Xor, SymEngine::Not, SymEngine::Or, SymEngine::And, SymEngine::Piecewise, SymEngine::Contains, SymEngine::BooleanAtom, SymEngine::Integer, SymEngine::Infty, SymEngine::Subs, SymEngine::Derivative, SymEngine::FunctionSymbol, SymEngine::MultiArgFunction, SymEngine::TwoArgBasic< Boolean >, SymEngine::OneArgFunction, SymEngine::GaloisField, SymEngine::Constant, SymEngine::ComplexDouble, SymEngine::Complex, and SymEngine::Add.

◆ neq()

bool SymEngine::Basic::__neq__ ( const Basic & o ) const

inline

true if this is not equal to o.

Returns: true if not equal

Definition at line 15 of file basic-inl.h.

 {
     return not(eq(*this, o));
 }

◆ str()

std::string SymEngine::Basic::__str__ ( ) const

Returns string representation of self.

Definition at line 46 of file basic.cpp.

 {
     return str(*this);
 }

◆ compare()

virtual int SymEngine::Basic::compare ( const Basic & o ) const

pure virtual

Returns -1, 0, 1 for this < o, this == o, this > o. This method is used when you want to sort things like x+y+z into canonical order. This function assumes that o is the same type as this. Use __cmp__ if you want general comparison.

Implemented in SymEngine::UPolyBase< Container, Poly >, SymEngine::UPolyBase< Cont, Poly >, SymEngine::Tuple, SymEngine::Dummy, SymEngine::Symbol, SymEngine::ImageSet, SymEngine::ConditionSet, SymEngine::Complement, SymEngine::Intersection, SymEngine::Union, SymEngine::Naturals0, SymEngine::Naturals, SymEngine::Integers, SymEngine::Rationals, SymEngine::Reals, SymEngine::Complexes, SymEngine::Interval, SymEngine::FiniteSet, SymEngine::UniversalSet, SymEngine::EmptySet, SymEngine::UnivariateSeries, SymEngine::RealDouble, SymEngine::Rational, SymEngine::Pow, SymEngine::MSymEnginePoly< Container, Poly >, SymEngine::MSymEnginePoly< MIntDict, MIntPoly >, SymEngine::MSymEnginePoly< MExprDict, MExprPoly >, SymEngine::NaN, SymEngine::Mul, SymEngine::ZeroMatrix, SymEngine::Transpose, SymEngine::Trace, SymEngine::MatrixSymbol, SymEngine::MatrixMul, SymEngine::MatrixAdd, SymEngine::ImmutableDenseMatrix, SymEngine::IdentityMatrix, SymEngine::HadamardProduct, SymEngine::DiagonalMatrix, SymEngine::ConjugateMatrix, SymEngine::Xor, SymEngine::Not, SymEngine::Or, SymEngine::And, SymEngine::Piecewise, SymEngine::Contains, SymEngine::BooleanAtom, SymEngine::Integer, SymEngine::Infty, SymEngine::Subs, SymEngine::Derivative, SymEngine::FunctionSymbol, SymEngine::MultiArgFunction, SymEngine::TwoArgBasic< Boolean >, SymEngine::OneArgFunction, SymEngine::GaloisField, SymEngine::Constant, SymEngine::ComplexDouble, SymEngine::Complex, and SymEngine::Add.

◆ hash()

hash_t SymEngine::Basic::hash ( ) const

inline

Returns the hash of the SymEngine class: This method caches the value

Use std::hash to get the hash. Example:

     RCP<const Symbol> x = symbol("x");
  std::hash<Basic> hash_fn;
  std::cout << hash_fn(*x);

Returns: 64-bit integer value for the hash

Definition at line 7 of file basic-inl.h.

 {
     if (hash_ == 0)
         hash_ = __hash__();
     return hash_;
 }

The documentation for this class was generated from the following files:

/home/runner/work/symengine/symengine/symengine/basic.h
/home/runner/work/symengine/symengine/symengine/basic-inl.h
/home/runner/work/symengine/symengine/symengine/basic.cpp
/home/runner/work/symengine/symengine/symengine/derivative.cpp

Public Member Functions

Static Public Member Functions

Data Fields

Private Attributes

Detailed Description

Member Function Documentation

◆ __eq__()

◆ __hash__()

◆ __neq__()

◆ __str__()

◆ compare()

◆ hash()

◆ eq()

◆ hash()

◆ neq()

◆ str()