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Basic concepts

From cppreference.com
< cpp‎ | language
 
 
C++ language
General topics
Flow control
Conditional execution statements
Iteration statements (loops)
Jump statements
Functions
Function declaration
Lambda function declaration
inline specifier
Exception specifications (until C++20)
noexcept specifier (C++11)
Exceptions
Namespaces
Types
Specifiers
decltype (C++11)
auto (C++11)
alignas (C++11)
Storage duration specifiers
Initialization
Expressions
Alternative representations
Literals
Boolean - Integer - Floating-point
Character - String - nullptr (C++11)
User-defined (C++11)
Utilities
Attributes (C++11)
Types
typedef declaration
Type alias declaration (C++11)
Casts
Implicit conversions - Explicit conversions
static_cast - dynamic_cast
const_cast - reinterpret_cast
Memory allocation
Classes
Class-specific function properties
Special member functions
Templates
Miscellaneous
 
 

This section provides definitions for the specific terminology and the concepts used when describing the C++ programming language.

A C++ program is a sequence of text files (typically header and source files) that contain declarations. They undergo translation to become an executable program, which is executed when the C++ implementation calls its main function.

Certain words in a C++ program have special meaning, and these are known as keywords. Others can be used as identifiers. Comments are ignored during translation. Certain characters in the program have to be represented with escape sequences.

The entities of a C++ program are values, objects, references, structured bindings (since C++17), functions, enumerators, types, class members, templates, template specializations, namespaces, and parameter packs. Preprocessor macros are not C++ entities.

Declarations may introduce entities, associate them with names and define their properties. The declarations that define all properties required to use an entity are definitions. A program must contain only one definition of any non-inline function or variable that is odr-used.

Definitions of functions usually include sequences of statements, some of which include expressions, which specify the computations to be performed by the program.

Names encountered in a program are associated with the declarations that introduced them using name lookup. Each name is only valid within a part of the program called its scope. Some names have linkage which makes them refer to the same entities when they appear in different scopes or translation units.

Each object, reference, function, expression in C++ is associated with a type, which may be fundamental, compound, or user-defined, complete or incomplete, etc.

Declared objects and declared references that are not non-static data members are variables.

[edit] See also

C documentation for Basic concepts