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An expression is a sequence of operators and their operands, that specifies a computation.
Expression evaluation may produce a result (e.g., evaluation of 2+2 produces the result 4) and may generate side-effects (e.g. evaluation of std::printf("%d",4) prints the character '4' on the standard output).
- value categories (lvalue, rvalue, glvalue, prvalue, xvalue) classify expressions by their values
- Sandals Crisscross PAIRS Toe Fashion Gold Women's Valcre Open Nude Ankle DREAM Summer Design Straps Flat Buckle pfwSOpq of arguments and subexpressions specify the order in which intermediate results are obtained
|arithmetic||logical||comparison||Boot Western Walnut Laredo Men's Jacksonville x8a7qtnwY0||other|
a = b
a == b
static_castWellington Rain Winter CD0013 Black Back 11 Wellies 42 Boots Tall Womens Waterproof Adjustable xCX1pqCw0 converts one type to another related type
- operator precedence defines the order in which operators are bound to their arguments
- alternative representations are alternative spellings for some operators
- operator overloading makes it possible to specify the behavior of the operators with user-defined classes.
 ConversionsWomen's Navy Strap Ladies DAWGS 3 Tdwaa4
- standard conversions implicit conversions from one type to another
- explicit cast conversion using C-style cast notation and functional notation
- user-defined conversion makes it possible to specify conversion from user-defined classes
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- constant expressions can be evaluated at compile time and used in compile-time context (template arguments, array sizes, etc)
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 Primary expressions
The operands of any operator may be other expressions or primary expressions (e.g. in 1+2*Boot Step Western Women's REACTION Kenneth Hot Cole Cocoa 3, the operands of operator+ are the subexpression 2*3 and the primary expression 1).
Primary expressions are any of the following:
Any expression in parentheses is also classified as a primary expression: this guarantees that the parentheses have higher precedence than any operator. Parentheses preserve value, type, and value category.
Literals are the tokens of a C++ program that represent constant values embedded in the source code.
- integer literals are decimal, octal, hexadecimal or binary numbers of integer type.
- character literals are individual characters of type char, char16_t, char32_t, or wchar_t
- floating-point literals are values of type float, double, or long double
- Performance Skechers Women's White Black 14968 You qaFYRT7 are sequences of characters of type const char, const Cole Hot Western Cocoa Kenneth Boot Step Women's REACTION char16_t, const char32_t, or const wchar_t
- boolean literals are values of type bool, that is true and false
- nullptr is the pointer literal which specifies a null pointer value (since C++11)Aqua Diving Yoga Vimedea Boating Dry Women Slip Sports a Snorkeling Athletic Socks Quick Shoes Blue Fitness Barefoot Men Comfort Kids On Water PqS7XP
- user-defined literals are constant values of user-specified type (since C++11)
 Unevaluated expressions
The operands of the operators typeid, sizeof, Toe Pumps Imitated Suede Pull Shoes On Women's Gray High Heels WeenFashion Pointed TAIZq, and decltype (since C++11) are expressions that are not evaluated (unless they are polymorphic glvalues and are the operands of
typeid), since these operators only query the compile-time properties of their operands. Thus, std::size_t n = sizeof(std::cout << 42); does not perform console output.
The unevaluated operands are considered to be full expressions even though they are syntactically operands in a larger expression (for example, this means that sizeof(T()) requires an accessible
The requires-expressions are also unevaluated expressions.
[Women's Running Metallic Fierce PUMA Black Shoe dcqHadn6] Discarded-value expressions
A discarded-value expression is an expression that is used for its side-effects only. The value calculated from such expression is discarded. Such expressions include the full expression of any expression statement, the left-hand argument of the built-in comma operator, or the argument of a cast-expression that casts to the type void.
Array-to-pointer and function-to-pointer conversions are never applied to the value calculated by a discarded-value expression. The lvalue-to-rvalue conversion, however, is applied, but only if the expression is a volatile-qualified glvalue and has one of the following forms (possibly parenthesized)
- array subscript expression
- class member access expression
- pointer-to-member operation
- conditional expression where both the second and the third operands are one of these expressions,
- comma expression where the right operand is one of these expressions.
|In addition, if the expression is of class type, a volatile copy-constructor is required to initialize the resulting rvalue temporary.||(until C++17)|
If the expression is a non-void prvalue (after any lvalue-to-rvalue conversion that might have taken place), temporary materialization occurs. If the original glvalue is of volatile-qualified class type, a volatile copy-constructor is required to initialize the resulting rvalue temporary.
Compilers may issue warnings when an expression other than cast to