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Note: C++11 is the now offical name for the next version of the C++ standard, previously known as C++0x.

C++11 introduces several new handy-dandy type inference capabilities that mean you can spend less time having to write out things the compiler already knows. There are, of course, times when you need to help out the compiler or your fellow programmers. But with C++11, you can spend less time on the mundane stuff and focus on the logic.

Let's start by looking at the most immediately obvious new benefit, the auto keyword.

The joy of auto

A quick refresher in case you didn't read about auto in the first article on C++0x. In C++11, if the compiler can infer the type of a variable at the point of declaration, instead of putting in the variable type, you can just write auto:

can now be replaced withThis, of course, is not the intended use of auto at all! It really shines when working with templates and iterators:There are other times where auto comes in handy, too. For example, let's say that you had some code of the form:

In this code, you can see that there are two necessary template parameters--one for the type of the 'builder' object, and a second for the type of the object being built. Even worse, the type of the built object cannot be deduced by the template parameter. Every call must look like this:

But auto immediately reduces this ugliness to nothing because you no longer need to be able to write the specific type at the point where you build the object. You can let C++ do it for you:

Now you only need a single template parameter, and that parameter is easily inferred when calling the function:

Auto Typer For Nitro Type

This is way better for the caller, and the template code loses nothing in readability--if anything, it's easier to understand!

The joy of decltype and the new return value syntax

Now you might be saying here--okay, that's great, but what if I wanted to *return* the value that this builder object created? I still need to provide the template argument becuase I need to provide the return type. Well, it turns out that the standards committee is full of smart people, and they have an extremely nice solution to this problem. It comes in two parts: decltype and the new return value syntax.

New Return Value Syntax

Let's start off with the new, optional, return value syntax, since it manages to find yet another use for auto. In all prior versions of C and C++, the return value of a function absolutely had to go before the function:

Auto Typer

In C++11, you can now put the return value at the end of the function declaration, substituting auto for the name of the return type, if you want to:

So would you want to do this? Let's look at a simple example where it helps us: a class with an enum declared inside it:

Here we have a simple class, Person, that has a type: whether the person is an adult, a child, or a senior citizen. Not much special about it, but what happens when you go to define the methods?

The first method, the setter, is trivial to declare, you can use the enum type PersonType without any trouble:

On the other hand, the second method is a bit of a mess. The nice clean looking code won't compile:

You have to write:

to make the return value work correctly. This isn't that big of a deal, but it's pretty easy to do by mistake, and it can get much messier when templates are involved.

This is where the new return value syntax comes in. Because the return value goes at the end of the function, instead of before it, you don't need to add the class scope. By the point the compiler reaches the return value, it already knows the function is part of the Person class, so it knows what PersonType is.

Okay, while that's very nice, does it really help us out? We can't use this new syntax to solve the problem we had before, can we? Well, not yet. Let's add one more concept: decltype

decltype

Decltype is auto's not-evil twin. Auto lets you declare a variable with a particular type; decltype lets you extract the type from a variable (or any other expression). What do I mean?

Touring Items Type S

You can use decltype for pretty much any expression, including to express the type for a return value from a method. Hmm, that sounds like a familiar problem doesn't it? What if we could write:

This would give us the type that is returned from makeObject, allowing us to specify the return value from makeAndProcessObject. We can combine this with the new return value syntax to produce this method:

This only works with the new return value syntax because under the old syntax, we couldn't refer to the function argument, builder, at the point where we declare the return type. With the new syntax, all of the arguments to a function are fair game!

Auto, References, Pointers and Const

One question that is sure to come up is how auto handles references:The short answer is in C++11, auto defaults to being by-value for references, so in the above code bar is an int. However, you can add the & as a modifier to force it to be a reference:On the other hand, if you have a pointer auto will automatically pick up pointerness:But you can also (thankfully) be explicit about it, and indicate that the variable is a pointer:You can similarly tack const onto auto if you need it, when dealing with references:Or with pointers:

Overall, it feels quite natural and normal, and it follows the normal type inference rules of templates in C++.

So, do compilers support this stuff?

As of this writing, GCC 4.4 and MSVC 10 both support everything I've talked about this article, and I'm used most of these techniques in production code; these aren't theoretical benefits, they're real. So if you're compiling your code with -std=c++0x in GCC or using MSVC 10, you can start using these techniques today. If you're using another compiler, check out this page for details of C++11 compiler support. Since the standard has been ratified, and should be published within weeks, now's the time to start.

Next: Lambda Functions in C++11 - the definitive guide One of the most exciting features of C++11 is ability to create lambda functions, learn what they are and how to use them
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