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C++11: Initializer lists
If you want to declare and initialize an array of five integers, you could do something like: But in C++03, what would happen if you would want to do the same thing using some STL container, like a...
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C++11: Lambda expressions
Consider you have a Person class: You want to store several instances of this class in a vector: If you want to sort this vector by the person ID, you could implement a PersonComparator and use the STL...
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C++11: Move semantics
Consider this example: You have a class A and a container called List<T>. As shown in the code below, the container is just a wrapper of a std::vector. You also have a function called getNObjects...
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C++11: Range-based for loop
In C++03, if I have a vector and want to show its elements, I could do something like this: That method will be useful to show any collection that has a begin() and an end() and an iterator with an...
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C++11: nullptr
In C and C++ we use the preprocessor macro NULL to say a pointer is not pointing to anywhere right now. The problem with NULL is that underneath it is just a plain 0. Consider the problem looking at...
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C++11: Variadic templates (functions)
A very interesting C++0x feature are the “variadic templates” that, in short, are template classes and functions with a variable number of parameterized types. They can be useful to do several things,...
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C++11: C++-style listener list
Consider you want to create a class where you can register a set of listeners to be notified when something occurs. For example, this is a class that performs some task and you want to be notified when...
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C++11: unordered maps
The STL ships with a sorted map template class that is commonly implemented as a balanced binary tree. The good thing on this is the fast search average time ( O(log2N) if implemented as a balanced...
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C++11: std::function and std::bind
std::function and std::bind were born inside the Boost C++ Library, but they were incorporated into the new C++11 standard. std::function is a STL template class that provides a very convenient wrapper...
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C++11: enable_if
std::enable_if is another feature taken from the Boost C++ library that now ships with every C++11 compliant compiler. As its name says, the template struct enable_if, enables a function only if a...
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C++11: reference_wrapper
Look at this piece of code: This program supposedly adds 80 to 20 and prints the result; it compiles perfectly but when you execute it; you get…. 0! Why? Because the bind method receives its parameters...
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C++11: std::thread
The standard library that ships with the new C++11 contains a set of classes to use threads. Before this, we needed to use the OS specific thread facilities each OS provides making our programs hard to...
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C++11: std::future and std::async
C++11 introduces support for asynchronous calls in a very easy way. An asynchronous call is a method invocation that will be executed in a separate thread (or core or processor); so, the caller of the...
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C++11: Smart Pointers, part 2: unique_ptr
C++11 ships with a set of out-of-the-box smart pointers that help us to manage the memory easily. One of those smart pointers is the unique_ptr. Consider this piece of code: If you execute this code...
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C++: Smart pointers, part 3: More on unique_ptr
Ok, here I am going to write about two other features that unique_ptr has that I did not mention in my last post. unique_ptr default behavior consists on take ownership of a pointer created with new...
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C++: Smart pointers, part 4: shared_ptr
As I mentioned in other posts, C++11 brings a new set of smart pointers into C++. The most useful smart pointer is shared_ptr: Its memory management policy consists in counting the number of shared_ptr...
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C++11: Perfect forwarding
Consider this function template invoke that invokes the function/functor/lambda expression passed as argument passing it the two extra arguments given: Nice, it works as expected and the result is: 30...
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C++: Smart pointers, part 5: weak_ptr
Some posts ago, I wrote about shared_ptr. In modern C++ applications (C++11 and later), you can replace almost all your naked pointers to shared_ptr and unique_ptr in order to have automatic resource...
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C++11: std::tuple
A tuple is a C++11 construction and it is built heavily on variadic templates. A tuple is a variadic class template that stores an unlimited set of values of different types, defined when instantiating...
View ArticleC++11: ‘decltype’
decltype is a new keyword that infers the type of a given expression. Though it can be used instead of auto; it is used mainly on return types. For example; this function: could be written using...
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