C++11

C++11 (ISO/IEC 14882:2011) is the most milestone version in C++ history, known as the starting point of "modern C++." It brought fundamental changes at both the language and standard library levels.

Core Changes

Language Level

Feature	Significance
auto type deduction	Reduces redundant type declarations
Rvalue references and move semantics	Eliminates unnecessary deep copies, greatly improving performance
Lambda expressions	First-class closures, simplifying STL algorithm usage
Variadic templates	Type-safe variadic functions, metaprogramming building blocks like enable_if
constexpr	Starting point for compile-time computation
nullptr	Type-safe null pointer constant
enum class	Scoped enumerations, eliminating implicit conversions
static_assert	Compile-time assertions
Delegating constructors	Constructor reuse
User-defined literals	Custom operator"" syntax sugar
Range-based for	Concise container iteration syntax

Standard Library Level

Component	Significance
unique_ptr / shared_ptr / weak_ptr	Replaces auto_ptr, correct resource ownership semantics
std::thread / std::mutex / std::atomic	First standardized multithreading support
std::array	Fixed-size array, replacing C-style arrays
std::tuple	Heterogeneous container
<chrono>	Type-safe time library
<regex>	Regular expressions
<random>	High-quality random numbers
std::function	Type-erased universal callable wrapper
std::reference_wrapper	Copyable reference wrapper
std::initializer_list	List initialization support
std::begin / std::end	Uniform iteration interface for arrays and containers
std::ratio	Compile-time rational arithmetic
Unordered containers	unordered_map, unordered_set

Why It Was a Watershed Moment

C++ before C++11 (C++98/03) and C++ after C++11 differ fundamentally in coding style:

• Move semantics changed the economics of pass-by-value — returning by value is no longer expensive
• Lambdas made algorithm-first coding possible over hand-written loops
• auto made iterators and template return values no longer a nightmare
• Concurrency went from "platform-dependent" to "language-guaranteed"

Compiler Support

Compiler	Full Support Version
GCC	4.8.1+
Clang	3.3+
MSVC	VS 2015 (19.0)+

Further Reading

Select a specific feature from the sidebar to begin reading, or start directly with auto type deduction.