//
// Cforall Version 1.0.0 Copyright (C) 2015 University of Waterloo
//
// The contents of this file are covered under the licence agreement in the
// file "LICENCE" distributed with Cforall.
//
// utility.h -- 
//
// Author           : Richard C. Bilson
// Created On       : Mon May 18 07:44:20 2015
// Last Modified By : Peter A. Buhr
// Last Modified On : Thu Jul  2 18:04:41 2015
// Update Count     : 16
//

#ifndef _UTILITY_H
#define _UTILITY_H

#include <iostream>
#include <sstream>
#include <iterator>
#include <string>
#include <cctype>
#include <list>

template< typename T >
static inline T * maybeClone( const T *orig ) {
	if ( orig ) {
		return orig->clone();
	} else {
		return 0;
	} // if
}

template< typename T, typename U >
static inline T * maybeBuild( const U *orig ) {
	if ( orig ) {
		return orig->build();
	} else {
		return 0;
	} // if
}

template< typename Input_iterator >
void printEnums( Input_iterator begin, Input_iterator end, const char * const *name_array, std::ostream &os ) {
	for ( Input_iterator i = begin; i != end; ++i ) {
		os << name_array[ *i ] << ' ';
	} // for
}

template< typename Container >
void deleteAll( Container &container ) {
	for ( typename Container::iterator i = container.begin(); i != container.end(); ++i ) {
		delete *i;
	} // for
}

template< typename Container >
void printAll( const Container &container, std::ostream &os, int indent = 0 ) {
	for ( typename Container::const_iterator i = container.begin(); i != container.end(); ++i ) {
		if ( *i ) {
			os << std::string( indent,  ' ' );
			(*i)->print( os, indent + 2 );
			os << std::endl;
		} // if
	} // for
}

template< typename SrcContainer, typename DestContainer >
void cloneAll( const SrcContainer &src, DestContainer &dest ) {
	typename SrcContainer::const_iterator in = src.begin();
	std::back_insert_iterator< DestContainer > out( dest );
	while ( in != src.end() ) {
		*out++ = (*in++)->clone();
	} // while
}

template< typename Container >
void assertAll( const Container &container ) {
	int count = 0;
	for ( typename Container::const_iterator i = container.begin(); i != container.end(); ++i ) {
		if ( !(*i) ) {
			std::cerr << count << " is null" << std::endl;
		} // if
	} // for
}

static inline std::string assign_strptr( const std::string *str ) {
	if ( str == 0 ) {
		return "";
	} else {
		std::string tmp;
		tmp = *str;
		delete str;
		return tmp;
	} // if
}

template< class T, typename ResultType, ResultType( T::* memfunc )() >
ResultType dispatch( T *pT ) {
	return (pT->*memfunc)();
}

template < typename T >
std::list<T> tail( std::list<T> l ) {
	if ( ! l.empty() ) {
		std::list<T> ret(++(l.begin()), l.end());
		return ret;
	} // if
}

template < typename T >
std::list<T> flatten( std::list < std::list<T> > l) {
	typedef std::list <T> Ts;

	Ts ret;

	switch ( l.size() ) {
	  case 0:
		return ret;
	  case 1:
		return l.front();
	  default:
		ret = flatten(tail(l));
		ret.insert(ret.begin(), l.front().begin(), l.front().end());
		return ret;
	} // switch
}

template < typename T > 
std::string toString ( T value ) {
	std::ostringstream os;
	os << value; // << std::ends;
	return os.str();
}

template< class Constructed, typename Arg >
Constructed *ctor( Arg arg ) {
	Constructed *c = new Constructed( arg );
	return c;
}

template< class Constructed, typename Arg >
Constructed ctor_noptr( Arg arg ) {
	return Constructed( arg );
}

template< typename T >
void replace( std::list< T > &org, typename std::list< T >::iterator pos, std::list< T > &with ) {
	typename std::list< T >::iterator next = pos; advance( next, 1 );

	//if ( next != org.end() ) {
	org.erase( pos );
	org.splice( next, with );
	//}

	return;
}

template< typename T1, typename T2 >
T2 *cast_ptr( T1 *from ) {
	return dynamic_cast< T2 * >( from );
}

template< class Exception, typename Arg >
void inline assert_throw( bool pred, Arg arg ) {
	if (pred) throw Exception( arg );
}

template< typename T >
struct is_null_pointer {
	bool operator()( const T *ptr ) { return ( ptr == 0 ); }
};

template< class InputIterator, class OutputIterator, class Predicate >
void filter(InputIterator begin, InputIterator end, OutputIterator out, Predicate pred) {
	while ( begin++ != end )
		if ( pred(*begin) ) *out++ = *begin;

	return;
}

template< class InputIterator1, class InputIterator2, class OutputIterator >
void zip( InputIterator1 b1, InputIterator1 e1, InputIterator2 b2, InputIterator2 e2, OutputIterator out ) {
	while ( b1 != e1 && b2 != e2 )
		*out++ = std::pair<typename InputIterator1::value_type, typename InputIterator2::value_type>(*b1++, *b2++);
}

template< class InputIterator1, class InputIterator2, class OutputIterator, class BinFunction >
void zipWith( InputIterator1 b1, InputIterator1 e1, InputIterator2 b2, InputIterator2 e2, OutputIterator out, BinFunction func ) {
	while ( b1 != e1 && b2 != e2 )
		*out++ = func(*b1++, *b2++);
}

// it's nice to actually be able to increment iterators by an arbitrary amount
template< typename Iterator >
Iterator operator+(Iterator i, int inc) {
	while ( inc > 0 ) {
		++i;
		--inc;
	}
	return i;
}

#endif // _UTILITY_H

// Local Variables: //
// tab-width: 4 //
// mode: c++ //
// compile-command: "make install" //
// End: //