constexpr variable cannot have non literal

Apr 28, 2015 · constructors can not be evaluated as core constant expressions (since I'm confident we'll have a good answer for lambdas + constexpr in C++17 a definition of a variable of nonliteral type or of static or thread storage 

Sep 8, 2011 · constexpr variables and static data members are required to be of literal type The type of a constexpr static data member is required to be a literal type because a class with a non constant in class initializer cannot have 

Jan 13, 2020 · Some C++ functions can be marked as constexpr and others cannot It doesn't include static variable declarations have parameter types and a result type that is are constexpr friendly (closely related to “literal” types in the constexpr metaprogramming, in the opinion of the authors, has not met its 

Feb 26, 2006 · include constant expression functions and user defined literals In addition, A constant expression function cannot be called before it is defined static constexpr int val; constexpr variable }; constexpr int S val = 7; As for other const variables, storage need not be allocated for a constant expression 

•(static) const variables in namespace scope of •if a constexpr member function (in a literal type) is const, you need to specify it •Quiz Does it make sense to have non const static assert(num < 1000, "can not handle large numbers");

C++11 Feature constexpr variables and static assert() •no local variables, but any “literal” type •simpler •Quiz Does it make sense to have non const constexpr member functions? 12 ASSERTM("can not compare tuples",false); &# endif

Nov 8, 2018 · Try catch blocks can't currently appear in constexpr functions This proposal does not break any code, since constexpr functions that contain try catch a definition of a variable of non literal type or of static or thread storage

Jan 30, 2019 · A decimal literal has the smallest type of int, long, or long long (ie, the first type in Variables declared as constexpr are implicitly const and must be When the expression decltype is applied to is not a variable, we get the type Do note the C style string cannot use relational operators to compare, 

25 Declaring Functions and Functors as constexpr where possible 11 3 Advanced not define a variable of non literal type or of static or thread storage duration By definition, such an evaluation can't have any side effects and is also hy

138 taking the address of a register variable is not allowed 139 taking the address of 229 bit field cannot contain all values of the enumerated type 230 nonstandard type for 976 a compound literal is not allowed in an integral constant expression 3650 statement may not appear in a constexpr constructor 3651 a