[diff.cpp14.class]

# Annex C (informative) Compatibility [[diff]](./#diff)

## C.4 C++ and ISO C++ 2014 [[diff.cpp14]](diff.cpp14#class)

### C.4.5 [[class]](class "11 Classes"): classes [diff.cpp14.class]

[1](#1)

[#](http://github.com/Eelis/draft/tree/9adde4bc1c62ec234483e63ea3b70a59724c745a/source/compatibility.tex#L1735)

**Affected subclause:** [[class.inhctor.init]](class.inhctor.init)  


**Change:** Inheriting a constructor no longer injects a constructor into the derived class[.](#1.sentence-1)

  


**Rationale:** Better interaction with other language features[.](#1.sentence-2)

  


**Effect on original feature:** Valid C++ 2014 code that uses inheriting constructors may not be valid
or may have different semantics[.](#1.sentence-3)

A [*using-declaration*](namespace.udecl#nt:using-declaration "9.10 The using declaration [namespace.udecl]") that names a constructor now makes the corresponding base class constructors
visible to initializations of the derived class
rather than declaring additional derived class constructors[.](#1.sentence-4)

[*Example [1](#example-1)*: struct A {template<typename T> A(T, typename T::type = 0);
 A(int);};struct B : A {using A::A;
 B(int);};
B b(42L); // now calls B(int), used to call B<long>(long),// which called A(int) due to substitution failure// in A<long>(long). — *end example*]