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Introduction
This chapter describes how to work with the standard algorithms and how to use them on the standard
containers. These algorithms were originally part of what is often referred to as the Standard Template
Library (STL), which is the set of algorithms, iterators, and containers that now belong to the standard
library (Chapter 6
contains recipes for working with the standard containers). I will refer to these simply
as the standard algorithms, iterators, and containers, but keep in mind that they are the same ones that
other authors' refer to as part of the STL. One of the pillars of the standard library is iterators, so the first
recipe explains what they are and how to use them. After that, there are a number of recipes that explain
how to use and extend the standard algorithms. Finally, if what you need isn't in the standard library, 
Recipe 7.10
explains how to write your own algorithm.
The recipes presented here are largely biased toward working with the standard containers for two
reasons. First, the standard containers are ubiquitous, and it's better to learn the standard than to reinvent
the wheel. Second, the algorithms in the standard library implementations provide a good model to follow
for interoperability and performance. If you watch how the pros do it in the standard library code, you
are likely to learn a few valuable lessons along the way.
All standard algorithms use iterators. Even if you are already familiar with the concept of iterators, which
is the subject of the first recipe, take a look at Table 7-1
, which contains a list of the conventions I use in
the rest of the chapter when listing function declarations for the standard algorithms.
Table 7-1. Iterator category abbreviations
Abbreviation
Meaning
In
Input iterator
Out
Output iterator
Fwd
Forward iterator
Bid
Bidirectional iterator
Rand
Random-access iterator
The standard algorithms also make use of function objects, or functors. A function object is a class that
has overridden operator( ) so that it can be called like a function. A functor that returns a bool (and does
not maintain state, and is therefore called pure) is called a predicate, and they are another regular feature
in the standard algorithms. Generally, a predicate takes one or two arguments: if it takes one argument, it
is an unary predicate; and if it takes two, it is called a binary predicate. For the sake of brevity, I use the
abbreviations listed in Table 7-2
when listing function declarations.
Table 7-2. Functor types
Type Name
Description
UnPred
An unary predicate. Takes one argument and
returns a bool.
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Recipe 7.1. Iterating Through a Container
Problem
You have a range of iteratorsmost likely from a standard containerand the standard algorithms don't fit
your needs, so you need to iterate through them.
Solution
Use an iterator or a const_iterator to access and advance through each of the elements in your container.
In the standard library, algorithms and containers communicate using iterators, and one of the very ideas
of the standard algorithms is that they insulate you from having to use iterators directly unless you are
writing your own algorithm. Even so, you should understand the different kinds of iterators so you can
use the standard algorithms and containers effectively. Example 7-1
presents some straightforward uses
of iterators.
Example 7-1. Using iterators with containers
#include <iostream>
#include <list>
#include <algorithm>
#include <string>
using namespace std;
static const int ARRAY_SIZE = 5;
template<typename T,
typename FwdIter>
FwdIter fixOutliersUBound(FwdIter p1,
FwdIter p2,
const T& oldVal,
const T& newVal) {
for ( ;p1 != p2; ++p1) {
if (greater<T>(*p1, oldVal)) {
*p1 = newVal;
}
}
}
int main( ) {
list<string> lstStr;
lstStr.push_back("Please");
lstStr.push_back("leave");
lstStr.push_back("a");
lstStr.push_back("message");
// Create an iterator for stepping through the list
for (list<string>::iterator p = lstStr.begin( );
p != lstStr.end( ); ++p) {
cout << *p << endl;
}
// Or I can use a reverse_iterator to go from the end
// to the beginning.  rbegin returns a reverse_iterator
// to the last element and rend returns a reverse_iterator
// to one-before-the-first.
for (list<string>::reverse_iterator p = lstStr.rbegin( );
p != lstStr.rend( ); ++p) {
cout << *p << endl;
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Recipe 7.2. Removing Objects from a Container
Problem
You want to remove objects from a container.
Solution
Use the container's erase member function to erase a single element or a range of elements, and possibly
use one of the standard algorithms to make the job easier. Example 7-2
shows a couple of different ways
to remove elements from a sequence.
Example 7-2. Removing elements from a container
#include <iostream>
#include <string>
#include <list>
#include <algorithm>
#include <functional>
#include "utils.h" // For printContainer( ): see 7.10
using namespace std;
int main( ) {
list<string> lstStr;
lstStr.push_back("On");
lstStr.push_back("a");
lstStr.push_back("cloudy");
lstStr.push_back("cloudy");
lstStr.push_back("day");
list<string>::iterator p;
// Find what you want with find
p = find(lstStr.begin( ), lstStr.end( ), "day");
p = lstStr.erase(p); // Now p points to the last element
// Or, to erase all occurrences of something, use remove
lstStr.erase(remove(lstStr.begin( ), lstStr.end( ), "cloudy"),
lstStr.end( ));
printContainer(lstStr); // See 7.10
}
Discussion
Use a container's erase member function to remove one or more elements from it. All containers have
two overloads of erase: one that takes a single iterator argument that points to the element you want to
delete, and another that takes two iterators that represent a range of elements you want deleted. To erase
a single element, obtain an iterator referring to that element and pass the iterator to erase, as in Example
7-2
:
p = find(lstStr.begin( ), lstStr.end( ), "day");
p = lstStr.erase(p);
This will delete the object that p refers to by calling its destructor, and then do any necessary
reorganization of the remaining elements in the range. The reorganization that happens depends on the
type of container, and therefore the complexity of the operation will vary from one kind of container to
another. The signature and behavior also differs slightly when you are using a sequence container versus
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