clang/test/CodeGenCXX/cxx1z-class-deduction.cpp

   1 // RUN: %clang_cc1 -std=c++1z %s -triple %itanium_abi_triple -emit-llvm -o - | FileCheck %s
   2
   3 template<typename T> struct A {
   4   A(T = 0);
   5   A(void*);
   6 };
   7
   8 template<typename T> A(T*) -> A<long>;
   9 A() -> A<int>;
  10
  11 // CHECK-LABEL: @_Z1fPi(
  12 void f(int *p) {
  13   // CHECK: @_ZN1AIiEC
  14   A a{};
  15
  16   // CHECK: @_ZN1AIlEC
  17   A b = p;
  18
  19   // CHECK: @_ZN1AIxEC
  20   A c = 123LL;
  21 }
  22
  23 namespace N {
  24   template<typename T> struct B { B(T); };
  25 }
  26 using N::B;
  27
  28 struct X {
  29   template<typename T> struct C { C(T); };
  30 };
  31
  32 // CHECK: @_Z1gIiEDaT_DTcv1AfL0p_ES1_IS0_E
  33 template<typename T> auto g(T x, decltype(A(x)), A<T>) {}
  34 // CHECK: @_Z1hIiEDaT_DTcvN1N1BEfL0p_ENS2_IS0_EE
  35 template<typename T> auto h(T x, decltype(B(x)), B<T>) {}
  36 // CHECK: @_Z1iI1XiEDaT0_DTcvNT_1CEfL0p_ENS2_1CIS1_EE(
  37 template<typename U, typename T> auto i(T x, decltype(typename U::C(x)), typename U::template C<T>) {}
  38 void test() {
  39   g(1, 2, A(3));
  40   h(1, 2, B(3));
  41   i<X>(1, 2, X::C(3));
  42 }