clang/test/SemaCXX/redeclared-alias-template.cpp

   1 // RUN: %clang_cc1 -fsyntax-only -verify -std=c++11 %s
   2
   3 template<typename T> using A = int; // expected-note 2{{previous}}
   4 template<typename T> using A = char; // expected-error {{type alias template redefinition with different types ('char' vs 'int')}}
   5 template<typename T1, typename T2> using A = T1; // expected-error {{too many template parameters in template redeclaration}}
   6
   7 template<typename T1, typename T2> using B = T1; // expected-note {{previous}}
   8 template<typename T2, typename T1> using B = T1; // expected-error {{type alias template redefinition with different types ('T1' (aka 'type-parameter-0-1') vs 'T1' (aka 'type-parameter-0-0'))}}
   9
  10
  11 template<typename> struct S;
  12 template<template<typename> class F> using FInt = F<int>;
  13 template<typename X> using SXRInt = FInt<S<X>::template R>;
  14 template<typename X> using SXRInt = typename S<X>::template R<int>; // ok, redeclaration.
  15
  16 template<template<typename> class> struct TT;
  17
  18 namespace FilterLookup {
  19   TT<A> f(); // expected-note {{previous declaration is here}}
  20
  21   template<typename> using A = int;
  22   TT<A> f(); // expected-error {{functions that differ only in their return type cannot be overloaded}}
  23 }