[PDF] constexpr function

The constexpr specifier declares that it is possible to evaluate the value of the function or variable at compile time. Such variables and functions can then be  constexpr variable · constexpr function · constexpr constructor · constexpr destructorAutres questions
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  • What is constexpr used for?

    constexpr indicates that the value, or return value, is constant and, where possible, is computed at compile time.
    A constexpr integral value can be used wherever a const integer is required, such as in template arguments and array declarations.21 fév. 2023

  • What is constexpr functions in C ++ 14?

    C++ 14 allows more than one statement. constexpr function should refer only to constant global variables. constexpr function can call only other constexpr functions not simple functions.
    The function should not be of a void type.17 jan. 2023

  • How do you write a constexpr function?

    A constexpr function must satisfy the following conditions:

    1It is not virtual.2Its return type is a literal type.3Each of its parameters must be of a literal type.4When initializing the return value, each constructor call and implicit conversion is valid in a constant expression.

  • How do you write a constexpr function?

    A call to a constexpr function produces the same result as a call to an equivalent non- constexpr function in all respects, except that a call to a constexpr function can appear in a constant expression.
    A constexpr function is implicitly inline.
    The main function cannot be declared with the constexpr specifier.

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Wording for Constexpr Lambda

01?/03?/2016 constexpr function (similar to the constexpr inference that ... to specify the function call operator (or template) as constexpr:.



Exploring constexpr at Runtime

13?/03?/2013 A constexpr function or constructor can be passed values that are only known at run-time. In this case the compiler generates code so the ...



Try-catch blocks in constexpr functions

08?/11?/2018 constexpr int f(int x) { try { return x + 1; } // ERROR: cant appear in constexpr function catch (...) { return 0; }. }.



Dont constexpr All The Things

13?/01?/2020 Some C++ functions can be marked as constexpr and others cannot. ... An appropriately marked constexpr function has the following ...



Abstract

08?/10?/2021 A C constexpr function that wants to provide an externally linkable definition should use extern inline the same as current C inline functions ...





Better support for constexpr in std::array

23?/09?/2015 constexpr to the member functions of std::array that can support it with a minimal amount of ... a constexpr function and then modify it.



constexpr class

15?/07?/2021 What about a member function that already carries constexpr? ... [P1235R0] proposed to make all functions implicitly constexpr.



Constexpr functions with const reference parameters (a summary)

14?/02?/2010 Allow constexpr for const T& arguments and return values. ... The definition of a constexpr function shall satisfy the.



constexpr consternation

08?/09?/2011 The introduction of forward-declarations of constexpr functions by ... instantiation of a constexpr template function declaration with no ...