[PDF] c++ constexpr variable cannot have non literal type

  • What are the limitations of constexpr?

    A constexpr function must accept and return only literal types.
    A constexpr function can be recursive.
    Before C++20, a constexpr function can't be virtual, and a constructor can't be defined as constexpr when the enclosing class has any virtual base classes.21 fév. 2023

  • What is a literal type in constexpr?

    Literal types are the types of constexpr variables and they can be constructed, manipulated, and returned from constexpr functions.
    Note: the standard doesn't define a named requirement with this name.
    This is a type category defined by the core language.
    It is included here as a named requirement only for consistency.

  • What is the difference between #define and constexpr?

    #define (also called a 'macro') is simply a text substitution that happens during preprocessor phase, before the actual compiler.
    And it is obviously not typed. constexpr on the other hand, happens during actual parsing.
    And it is indeed typed.

  • What is the difference between #define and constexpr?

    The main advantage of this feature is that it allows us to use a function to evaluate compile-time constant.
    With this, we could calculate the size of the array at compile time which was not possible before.

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constexpr consternation

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Constexpr Lambda

28 avr. 2015 constructors can not be evaluated as core constant expressions (since closure objects are non-literal types).



Wording for Constexpr Lambda

1 mars 2016 data-members is a literal type. This would allow the relevant special member functions to be constexpr (if not deleted) and thus.



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24 avr. 2006 it returns a value (i.e. has non-void return type); ... static constexpr int val; // constexpr variable. }; constexpr int S::val = 7;.



Class Types in Non-Type Template Parameters

30 mars 2018 Non-type template parameters are one of the few places in C++ ... of the constexpr keyword leaving us in a situation where we have a great.



Dont constexpr All The Things

13 janv. 2020 Some C++ functions can be marked as constexpr and others cannot. ... is are constexpr-friendly (closely related to “literal” types in the.



Generalized Constant Expressions — Revision 2

26 févr. 2006 to the macro INT_MAX is not an integral constant. That is due to an unnecessarily ... static constexpr int val; // constexpr variable.



General Constant Expressions for System Programming Languages

stream system programming languages such as C and C++ do not have standard the notion of literal types



Modern C++

mechanism is the same as for automatic deducation of variable types. which are not known during compilation and can not have any side effects.



constexpr Introduction - Scott Schurr - CppCon 2015.key

constexpr objects can't change at runtime Static data member of literal type static constexpr char who[] ... calculations might not have the same.

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