source: src/Common/utility.h @ be945ac

//
// 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 : Rob Schluntz
// Last Modified On : Thu Apr 28 13:18:24 2016
// 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 );
                        // need an endl after each element because it's not easy to know when each individual item should end
                        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: //