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Specifier keyword to query an expression's type
In the C++ programming language, decltype (for "declared type") is a specifier keyword used to query the type of an expression. Introduced in C++11, its
Decltype
2014 edition of the C++ programming language standard
// decltype(x3a) is int decltype(i) x3d = i; // decltype(x3d) is int auto x4a = (i); // decltype(x4a) is int decltype((i)) x4d = (i); // decltype(x4d)
C++14
operator name unless the type is inferred (e.g. operator auto(), operator decltype(auto)() etc.). The type name can also be inferred (e.g new auto) if an
Operators_in_C_and_C++
2011 edition of the C++ programming language standard
int decltype(c) e; // e has type int, the type of the entity named by c decltype((c)) f = c; // f has type int&, because (c) is an lvalue decltype(0) g;
C++11
Programming language operator
value; } const Double* d; // decltype can be used in type declarations decltype(d->value) y; // equivalent to double y; // decltype can be used in trailing
Typeof
C++ alternative syntax for return types
function's return type would use the two formal parameter names with decltype: decltype(lhs + rhs). However, where a return type is traditionally specified
Trailing_return_type
Object relationship in programming language
Graph; HashSet<SharedPtr<Vertex>> edges; String name; using EdgesIterator = decltype(edges.cbegin()); public: explicit Vertex(const String& name): name{std::move(name)}
Friend_class
Datatype in C++
int& RrefInt&& r5 = 5; // r5 has the type int&& decltype(r2)& r6 = i; // r6 has the type int& decltype(r2)&& r7 = i; // r7 has the type int& A non-static
Reference_(C++)
Higher-order function Y for which Y f = f (Y f)
fix = [](auto f) { return [f](auto&&... args) -> decltype(auto) { return f(f, std::forward<decltype(args)>(args)...); }; }; auto factorial = fix([](auto
Fixed-point_combinator
Programming language syntax designed for ease of use
block. C++ and C from C23 onwards allow auto x = expr as a shorthand for decltype(expr) x = expr in C++ or typeof(expr) x = expr in C. Python list comprehensions
Syntactic_sugar
Integrated development environment product
mainly consists of six compiler features: lambdas, rvalue references, auto, decltype, static_assert, and nullptr. C++11 also supports library features (e.g
Microsoft_Visual_C++
Templates in computer programming
fix = [](auto f) { return [f](auto&&... args) -> decltype(auto) { return f(f, std::forward<decltype(args)>(args)...); }; }; auto factorial = fix([](auto
Variadic_template
Comparison of programming languages
type of either a type or an expression. In C++, the equivalent feature is decltype. C++ adds numerous additional keywords to support its new features. This
Compatibility_of_C_and_C++
Basic programming language construct
Yes Yes No No C++ (same as C) (same as C plus) typeid new delete throw decltype static_cast dynamic cast reinterpret_cast const_cast Yes Yes Yes Yes Yes
Operator (computer programming)
Operator_(computer_programming)
Programming construct
compare(const int& a, const int& b) noexcept { return a < b; } using CompareFn = decltype(compare); operator CompareFn*() const { return compare; } }; int main()
Function_object
Rules defining correctly structured Java programs
depended upon, whereas in C++ the lambda type may still be extracted with decltype to obtain a real unique closure type; a lambda's java.lang.Class<?> cannot
Java_syntax
Comparison between two programming languages
while in C++, lambdas have a real runtime class which can be accessed with decltype and are part of the language model. Java lambdas depend on the functional
Comparison_of_Java_and_C++
Set of rules defining correctly structured C++ program
constinit const_cast continue contract_assert co_await co_return co_yield decltype default do double dynamic_cast else enum explicit export extern float for
C++_syntax
[](double x) -> double { return x; }; decltype(f0) fa[3] = {f0, f1, [](double x) -> double { return x * x; }}; vector<decltype(f0)> fv = {f0, f1}; fv.push_back([](double
Examples of anonymous functions
Examples_of_anonymous_functions
Type of data structure
name. Their types, which are compiler-generated, may be retrieved using decltype. class { private: int value; public: int getValue() { return value; } void
C++_classes
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Boy/Male
Hindu
Very rich king, A Raga
Female
Irish
(pron. Shinade) Irish Gaelic form of French Jeanette, SINÉAD means "God is gracious."Â
Male
Hebrew
Variant spelling of Hebrew Iyowb, IYOV means "hated, oppressed."Â
Girl/Female
Indian, Modern
Love
Boy/Male
Hindu, Indian, Marathi, Sindhi, Telugu, Traditional
Happy Like Cloud
Girl/Female
Hindu, Indian
Lovely
Boy/Male
Indian, Sanskrit
Blind; Lawless
Boy/Male
American, Australian, British, Christian, Czechoslovakian, Danish, Dutch, English, Finnish, French, German, Jamaican, Polish, Swedish, Swiss, Teutonic
Shining Intellect; Bright Mind; Intelligent; Bright Heart; Bright Hear; Mind and Spirit
Male
Irish
Variant spelling of Irish Gaelic Bruadair, BRUADAR means "dream."Â
Boy/Male
Arabic, Muslim
Generosity of the All-merciful
DECLTYPE
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