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Showing content from https://en.cppreference.com/w/cpp/language/../keyword/../language.html below:

C++ language - cppreference.com

This is a reference of the core C++ language constructs.

Basic concepts

Comments
ASCII chart
Punctuation
Names and identifiers
Types – Fundamental types
Object – Scope – Lifetime
Definitions and ODR
Name lookup
    qualified – unqualified (ADL)
As-if rule
Undefined behavior (UB)
Memory – Multithread (C++11)
Character sets and encodings
Phases of translation
The main function
Modules (C++20)
Contracts (C++26)

Keywords

Preprocessor

#if - #ifdef - #ifndef - #elif
#elifdef - #elifndef (C++23)
#define - # - ##
#include - #pragma
#line - #error
#warning (C++23)

Expressions

Value categories
Evaluation order
Constant expressions
Operators
    assignment – arithmetic
    increment and decrement
    logical – comparison
    member access
    call, comma, ternary
    sizeof – alignof (C++11)
    new – delete – typeid
    alternative representation
Default comparisons (C++20)
Operator precedence
Conversions
    implicit – explicit
    user-defined
    Usual arithmetic conversions
    static_cast – dynamic_cast
    const_cast
    reinterpret_cast
Literals (Escape sequences)
    boolean – integer – floating
    character – string
    nullptr (C++11)
    user-defined (UDL) (C++11)

Declarations

Conflicting declarations
Storage duration and linkage
Translation-unit-local (C++20)
Language linkage
Namespace declaration
Namespace alias
References – Pointers – Arrays
Structured bindings (C++17)
Enumerations and enumerators
inline specifier
Inline assembly
const/volatile
constexpr (C++11)
consteval (C++20)
constinit (C++20)
decltype (C++11)
auto (C++11)
typedef – Type alias (C++11)
Elaborated type specifiers
Attributes (C++11)
alignas (C++11)
static_assert (C++11)

Initialization

Default-initialization
Value-initialization
Copy-initialization
Direct-initialization
Aggregate initialization
List-initialization (C++11)
Reference initialization
Static non-local initialization
    zero – constant
Dynamic non-local initialization
    ordered – unordered
Copy elision (RVO)

Functions

Function declaration
Default arguments
Variadic arguments
Lambda expression (C++11)
Overload resolution
Operator overloading
Address of an overload set
Coroutines (C++20)
Replacement functions

Statements

if – switch
for – range-for (C++11)
while – do-while
continue – break
goto – return
contract_assert (C++26)
synchronized/atomic (TM TS)

Classes

Class types – Union types
injected-class-name
Data members – Bit-fields
Member functions – The this pointer
Static members – Nested classes
Derived class – using-declaration
Empty base optimization (EBO)
Virtual function – Abstract class (ABC)
override (C++11) – final (C++11)
Member access – friend
Constructors and member initializer lists
Default constructor – Destructor
Copy constructor – Copy assignment
Move constructor (C++11)
Move assignment (C++11)
Converting constructor
explicit specifier

Templates

Template parameters
Template arguments
Class template – Function template
Variable template (C++14)
Class member template
Template argument deduction
    function – class (CTAD) (C++17)
Explicit specialization – Partial specialization
Packs (C++11) – sizeof... (C++11)
Fold expressions (C++17)
Pack indexing (C++26)
Dependent names – SFINAE
Constraints and concepts (C++20)
Requires expression (C++20)

Exceptions

try block
Throwing exceptions
Handling exceptions
Exception specification
    noexcept specification (C++11)
    Dynamic specification (until C++17*)
noexcept operator (C++11)

Miscellaneous

History of C++
Extending the namespace std
Acronyms: AFO, CPO, IFNDR, NDR,
NTBS, NTTP, RAO, SOCCC, TMP, TU

Idioms

Curiously Recurring Template Pattern (CRTP)
Pointer to implementation (PIMPL)
Resource acquisition is initialization (RAII)
Rule of three/five/zero
Zero-overhead principle

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