[depr.static.constexpr]

# Annex D (normative) Compatibility features [[depr]](./#depr)

## D.7 Redeclaration of static constexpr data members [depr.static.constexpr]

[1](#1)

[#](http://github.com/Eelis/draft/tree/9adde4bc1c62ec234483e63ea3b70a59724c745a/source/future.tex#L148)

For compatibility with prior revisions of C++, a constexpr static data member may be redundantly redeclared outside the class with no
initializer ([[basic.def]](basic.def "6.2 Declarations and definitions"), [[class.static.data]](class.static.data "11.4.9.3 Static data members"))[.](#1.sentence-1)

This usage is deprecated[.](#1.sentence-2)

[*Example [1](#example-1)*: struct A {static constexpr int n = 5; // definition (declaration in C++ 2014)};

constexpr int A::n; // redundant declaration (definition in C++ 2014) â *end example*]
