test_iterators.cxx File Reference

#include "WireCellUtil/Iterator.h"
#include "WireCellUtil/IteratorBase.h"
#include "WireCellUtil/Testing.h"
#include <boost/range.hpp>
#include <boost/function.hpp>
#include <vector>
#include <iostream>
#include <algorithm>
#include <iterator>
#include <memory>
#include <cmath>

Go to the source code of this file.

Classes
struct	IMyClass
struct	MyClass
struct	SelectInt
struct	SelectInRange

Typedefs
typedef Iterator< const IMyClass * >	my_iterator
typedef std::pair< my_iterator, my_iterator >	my_range
typedef IteratorBase< const IMyClass * >	my_base_iterator
typedef vector< MyClass * >	MyStoreType
typedef IteratorAdapter< MyStoreType::iterator, my_base_iterator >	my_adapted_iterator
typedef boost::function< bool(const IMyClass *)>	my_selector

Functions
my_range	get_data (MyStoreType &store)
int	main ()

Variables
SelectInt	get1 = SelectInt(1)
my_selector	get10 = SelectInt(10)
SelectInRange	just_right = SelectInRange(5,10)

Typedef Documentation

typedef IteratorAdapter< MyStoreType::iterator, my_base_iterator > my_adapted_iterator

Definition at line 63 of file test_iterators.cxx.

typedef IteratorBase< const IMyClass* > my_base_iterator

Definition at line 50 of file test_iterators.cxx.

typedef Iterator<const IMyClass*> my_iterator

Definition at line 41 of file test_iterators.cxx.

typedef std::pair<my_iterator, my_iterator> my_range

Definition at line 44 of file test_iterators.cxx.

typedef boost::function<bool (const IMyClass*)> my_selector

Definition at line 67 of file test_iterators.cxx.

typedef vector< MyClass* > MyStoreType

Definition at line 57 of file test_iterators.cxx.

Function Documentation

my_range get_data

(

MyStoreType &

store

)

Definition at line 90 of file test_iterators.cxx.

{
    return my_range(my_adapted_iterator(store.begin()),
                    my_adapted_iterator(store.end()));
}

int main

(

void

)

Definition at line 97 of file test_iterators.cxx.

{

    // This would be deep in side some custom class.
    MyStoreType store;
    store.push_back(new MyClass(0,0.0));
    store.push_back(new MyClass(1,42.));
    store.push_back(new MyClass(2,6.9));

    MyClass* first = *(store.begin());
    AssertMsg(first, "No first");
    AssertMsg(first->get_i() == 0 && first->get_f() == 0.0, "first ain't first");

    // This would be an element of the base class's interface which
    // the custom class implements.  It returns generic iterators on
    // the base/interface data type.  These iterators may be copied
    // without slicing.
    my_range r = get_data(store);

    // Finally, here is some client of the interface using the data
    // born deep inside the custom class and accessing it only via
    // interfaces.
    for (my_iterator it = boost::begin(r); it != boost::end(r); ++it) {
        // make a temp for syntactic convenience/clarity
        const IMyClass* myptr = *it; 
        const IMyClass& myobj = *myptr;
        cout << myobj.get_i() << " "
             << myobj.get_f() << endl;
    }


    vector< const IMyClass* > res(r.first, r.second);
    AssertMsg(res.size(), "range constructor failed.");
    res.clear();

    copy(r.first, r.second, back_inserter(res));
    AssertMsg(res.size(), "copy failed.");
    res.clear();


    copy_if(boost::begin(r), boost::end(r), back_inserter(res), get1);
    cerr << "Got: " << res.size() << endl;
    AssertMsg(1 == res.size(), "Failed to get1");
    AssertMsg(res[0]->get_f() == 42., "Got wrong1");
    res.clear();

    copy_if(boost::begin(r), boost::end(r), back_inserter(res), get10);
    AssertMsg(0 == res.size(), "Got get10 but should not.");
    res.clear();
        
    copy_if(boost::begin(r), boost::end(r), back_inserter(res), just_right);
    AssertMsg(1 == res.size(), "Failed to get just_right");
    cerr << "Got: " << res[0]->get_i() << " " << res[0]->get_f() << endl;
    AssertMsg(res[0]->get_i() == 2 && fabs(res[0]->get_f() - 6.9) < 1e-6, "Got just_wrong value");
    res.clear();

    return 0;
}

Variable Documentation

SelectInt get1 = SelectInt(1)

Definition at line 85 of file test_iterators.cxx.

my_selector get10 = SelectInt(10)

Definition at line 86 of file test_iterators.cxx.

SelectInRange just_right = SelectInRange(5,10)

Definition at line 87 of file test_iterators.cxx.