clang/test/PCH/cxx2a-constraints.cpp

   1 // RUN: %clang_cc1 -std=c++2a -emit-pch %s -o %t
   2 // RUN: %clang_cc1 -std=c++2a -include-pch %t -verify %s
   3
   4 // RUN: %clang_cc1 -std=c++2a -emit-pch -fpch-instantiate-templates %s -o %t
   5 // RUN: %clang_cc1 -std=c++2a -include-pch %t -verify %s
   6
   7 // expected-no-diagnostics
   8
   9 #ifndef HEADER
  10 #define HEADER
  11
  12 template<typename T, typename U = char>
  13 concept SizedLike = sizeof(T) == sizeof(U);
  14
  15 template <class T> void f(T) requires (sizeof(int) == sizeof(T)) {}
  16 template <class T> void f(T) requires (sizeof(char) == sizeof(T)) {}
  17
  18 template <class T> requires (sizeof(int) == sizeof(T)) void g(T) {}
  19 template <class T> requires (sizeof(char) == sizeof(T)) void g(T) {}
  20
  21 template <SizedLike<int> T> void h(T) {}
  22 template <SizedLike<char> T> void h(T) {}
  23
  24 template <SizedLike<int> T> void i(T) {}
  25 template <SizedLike T> void i(T) {}
  26
  27 void j(SizedLike<int> auto ...ints) {}
  28
  29 template<template<SizedLike> class P> struct S1 { };
  30
  31 #else /*included pch*/
  32
  33 int main() {
  34   (void)f('1');
  35   (void)f(1);
  36   (void)g('1');
  37   (void)g(1);
  38   (void)h('1');
  39   (void)h(1);
  40   (void)i('1');
  41   (void)i(1);
  42   (void)j(1, 2, 3);
  43 }
  44
  45 #endif // HEADER