vector_checker.hpp
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Created: Thu, Nov 7, 22:10

vector_checker.hpp
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	/* =============================================================================

	Copyright (c) 2014 - 2016
	F. Georget <fabieng@princeton.edu> Princeton University
	All rights reserved.


	Redistribution and use in source and binary forms, with or without modification,
	are permitted provided that the following conditions are met:

	1. Redistributions of source code must retain the above copyright notice,
	this list of conditions and the following disclaimer.

	2. Redistributions in binary form must reproduce the above copyright notice,
	this list of conditions and the following disclaimer in the documentation
	and/or other materials provided with the distribution.

	3. Neither the name of the copyright holder nor the names of its
	contributors may be used to endorse or promote products derived from this
	software without specific prior written permission.

	* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
	AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
	IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
	DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE FOR
	ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
	(INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
	LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON
	ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
	(INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
	SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. *

	============================================================================= */

	#ifndef SPECMICP_UTILS_VECTORCHECKER_HPP
	#define SPECMICP_UTILS_VECTORCHECKER_HPP

	#include "specmicp_common/types.hpp"
	#include <cmath>
	#include <utility>

	#include <iostream>

	namespace specmicp {
	//! \namespace specmicp::vector_checker
	//! \brief Check values in a vector
	namespace vector_checker {

	//! \brief Type for the
	template <typename ScalarT>
	using VectorT = Eigen::template Matrix<ScalarT, Eigen::Dynamic, 1>;

	//! \brief The base class of an expression
	template <typename Derived>
	struct BaseBoolExpr
	{
	//! \brief Return the Derived class
	const Derived& self() const {return static_cast<const Derived&>(*this);}

	//! \brief Evaluate the expression
	bool operator() () const {return self().out_impl();}

	//! \brief Evalute the expression when assigned to a boolean
	operator bool() const {return self().out_impl();}
	};

	//! \brief Evaluate a logical AND expression
	template <typename Derived0, typename Derived1>
	class AndBoolExpr: public BaseBoolExpr<AndBoolExpr<Derived0, Derived1>>
	{
	using Child0 = Derived0;
	using Child1 = Derived1;

	public:
	AndBoolExpr(const Child0& child_0, const Child1& child_1):
	m_child_0(child_0),
	m_child_1(child_1)
	{}
	AndBoolExpr(
	BaseBoolExpr<Derived0>&& child_0,
	BaseBoolExpr<Derived1>&& child_1
	):
	m_child_0(std::move(child_0.self())),
	m_child_1(std::move(child_1.self()))
	{}

	bool out_impl() const {
	if (m_child_0())
	return m_child_1();
	return false;
	}

	private:
	Child0 m_child_0;
	Child1 m_child_1;
	};

	//! \brief Evaluate a logical OR Expression
	template <typename Derived0, typename Derived1>
	class OrBoolExpr: public BaseBoolExpr<OrBoolExpr<Derived0, Derived1>>
	{
	using Child0 = Derived0;
	using Child1 = Derived1;

	public:
	OrBoolExpr(const Child0& child_0, const Child1& child_1):
	m_child_0(child_0),
	m_child_1(child_1)
	{}
	OrBoolExpr(
	BaseBoolExpr<Derived0>&& child_0,
	BaseBoolExpr<Derived1>&& child_1
	):
	m_child_0(std::move(child_0.self())),
	m_child_1(std::move(child_1.self()))
	{}

	bool out_impl() const {
	if (m_child_0())
	return true;
	return m_child_1();
	}

	private:
	Child0 m_child_0;
	Child1 m_child_1;
	};

	//! \brief True if the underlying condition is true for all element
	//!
	//! Evaluate a condition for all element in a vector,
	//! check if the condition formed by 'element BinaryOpTag rhs' is true
	//! for all element
	template <typename BinaryOpTag, typename ScalarT>
	class AllExpr: public BaseBoolExpr<AllExpr<BinaryOpTag, ScalarT>>
	{
	public:
	AllExpr(const VectorT<ScalarT>& vector, ScalarT rhs):
	m_vector(vector),
	m_rhs(rhs)
	{}

	bool out_impl() const
	{
	bool is_true = true;
	for (typename VectorT<ScalarT>::Index id=0; id< m_vector.rows(); ++id)
	{
	if (not op(m_vector(id), m_rhs)) {
	is_true = false;
	break;
	}
	}
	return is_true;
	}

	private:
	BinaryOpTag op;
	const VectorT<ScalarT>& m_vector;
	ScalarT m_rhs;
	};

	//! \brief Wrapper around a vector for creating a 'All' condition
	template <typename ScalarT>
	class All
	{
	public:
	All(const VectorT<ScalarT>& vector):
	m_vector(vector)
	{}

	const VectorT<ScalarT>& operator() () const {return m_vector;}

	private:
	const VectorT<ScalarT>& m_vector;
	};

	//! \brief Create a 'All' wrapper from a vector
	template <typename ScalarT>
	All<ScalarT> all(const VectorT<ScalarT>& vector)
	{
	return All<ScalarT>(vector);
	}

	//! \brief True if the underlying condition is true for at least one element
	//!
	//! Evaluate the condition 'element BinaryOpTag rhs' to see if it is true for
	//! at least one element
	template <typename BinaryOpTag, typename ScalarT>
	class AnyExpr: public BaseBoolExpr<AnyExpr<BinaryOpTag, ScalarT>>
	{
	public:
	AnyExpr(const VectorT<ScalarT>& vector, ScalarT rhs):
	m_vector(vector),
	m_rhs(rhs)
	{}

	bool out_impl() const
	{
	bool is_true = false;
	for (typename VectorT<ScalarT>::Index id=0; id< m_vector.rows(); ++id)
	{
	if (op(m_vector(id), m_rhs)) {
	is_true = true;
	break;
	}
	}
	return is_true;
	}

	private:
	BinaryOpTag op;
	const VectorT<ScalarT>& m_vector;
	ScalarT m_rhs;
	};

	//! \brief Wrapper around a vector to create a 'Any' condition
	template <typename ScalarT>
	class Any
	{
	public:
	Any(const VectorT<ScalarT>& vector):
	m_vector(vector)
	{}

	const VectorT<ScalarT>& operator() () const {return m_vector;}

	private:
	const VectorT<ScalarT>& m_vector;
	};

	//! \brief create a 'Any' wrapper
	template <typename ScalarT>
	Any<ScalarT> any(const VectorT<ScalarT>& vector)
	{
	return Any<ScalarT>(vector);
	}

	//! \brief True if all elements of a vector are bounded
	//!
	//! Bounds must be finite
	template <typename ScalarT>
	class BoundedExpr: public BaseBoolExpr<BoundedExpr<ScalarT>>
	{
	public:
	BoundedExpr(
	const VectorT<ScalarT>& vector,
	ScalarT lower_bound,
	ScalarT upper_bound
	):
	m_vector(vector),
	m_lower(lower_bound),
	m_upper(upper_bound)
	{}

	bool out_impl() const
	{
	bool is_true = true;
	for (typename VectorT<ScalarT>::Index id=0; id< m_vector.rows(); ++id)
	{
	const ScalarT& value = m_vector(id);
	if (not
	(std::isfinite(value) &&
	value >= m_lower &&
	value <= m_upper)
	) {
	is_true = false;
	break;
	}
	}
	return is_true;
	}

	private:
	const VectorT<ScalarT>& m_vector;
	ScalarT m_lower;
	ScalarT m_upper;
	};


	//! \brief create a 'Bounded' expression
	template <typename ScalarT>
	BoundedExpr<ScalarT> is_bounded(
	const VectorT<ScalarT>& vector,
	ScalarT lower,
	ScalarT upper
	)
	{
	return BoundedExpr<ScalarT>(vector, lower, upper);
	}


	// Logical Operators
	// =================

	//! \brief Evaluate the logical AND between two expressions
	template <typename Derived0, typename Derived1>
	AndBoolExpr<Derived0, Derived1> operator&& (
	BaseBoolExpr<Derived0>&& child_0,
	BaseBoolExpr<Derived1>&& child_1)
	{
	return AndBoolExpr<Derived0, Derived1>(
	std::forward<BaseBoolExpr<Derived0>>(child_0),
	std::forward<BaseBoolExpr<Derived1>>(child_1)
	);
	}

	//! \brief Evaluate the logical AND between two expressions
	template <typename Derived0, typename Derived1>
	OrBoolExpr<Derived0, Derived1> operator\|\| (
	BaseBoolExpr<Derived0>&& child_0,
	BaseBoolExpr<Derived1>&& child_1)
	{
	return OrBoolExpr<Derived0, Derived1>(
	std::forward<BaseBoolExpr<Derived0>>(child_0),
	std::forward<BaseBoolExpr<Derived1>>(child_1)
	);
	}


	// Comparison Operator
	// ===================

	#define make_tag_operator(name, op) \
	struct name \
	{ \
	template <typename ScalarT> \
	bool operator() (const ScalarT& lhs, const ScalarT& rhs) const { \
	return (lhs op rhs); \
	} \
	};

	#define make_operator_overloading_class(name, op, class_name) \
	template <typename ScalarT> \
	class_name ## Expr<name, ScalarT> operator op (class_name<ScalarT>&& lhs, ScalarT rhs) \
	{ \
	return class_name ## Expr<name, ScalarT>(lhs(), rhs); \
	}

	#define make_operator_overloading_all(name, op) \
	make_operator_overloading_class(name, op, All)

	#define make_operator_overloading_any(name, op) \
	make_operator_overloading_class(name, op, Any)

	#define make_operator(name, op) \
	make_tag_operator(name, op) \
	make_operator_overloading_all(name, op) \
	make_operator_overloading_any(name, op)



	make_operator(DifferentThan, !=)
	make_operator(EqualTo, ==)
	make_operator(GreaterThan, >)
	make_operator(GreaterThanOrEqualTo, >=)
	make_operator(LessThan, <)
	make_operator(LessThanOrEqualTo, <=)

	#undef make_operator
	#undef make_operator_overloading_any
	#undef make_operator_overloading_all
	#undef make_operator_overloading_class
	#undef make_tag_operator

	// special operator
	struct IsFinite
	{
	template <typename ScalarT>
	bool operator() (const ScalarT& lhs, const ScalarT& _) const {
	return (std::isfinite(lhs));
	}
	};

	//! \brief check that all element of a vector is finite
	template <typename ScalarT>
	AllExpr<IsFinite, ScalarT> is_finite(const VectorT<ScalarT>& vector)
	{
	return AllExpr<IsFinite, ScalarT>(vector, 0.0);
	}

	//! \brief create a 'LowerBounded' expression
	template <typename ScalarT>
	AllExpr<GreaterThanOrEqualTo, ScalarT> is_lower_bounded(
	const VectorT<ScalarT>& vector,
	ScalarT lower
	)
	{
	return AllExpr<GreaterThanOrEqualTo, ScalarT>(vector, lower);
	}


	//! \brief create a 'UpperBounded' expression
	template <typename ScalarT>
	AllExpr<LessThanOrEqualTo, ScalarT> is_upper_bounded(
	const VectorT<ScalarT>& vector,
	ScalarT upper
	)
	{
	return AllExpr<LessThanOrEqualTo, ScalarT>(vector, upper);
	}

	} //end namespace vector_checker
	} //end namespace specmicp

	#endif // SPECMICP_UTILS_VECTORCHECKER_HPP

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