libcxx/test/std/numerics/complex.number/complex.special/gh_101960_ambiguous_ctor.pass.cpp

   1 //===----------------------------------------------------------------------===//
   2 //
   3 // Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
   4 // See https://llvm.org/LICENSE.txt for license information.
   5 // SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
   6 //
   7 //===----------------------------------------------------------------------===//
   8
   9 // <complex>
  10
  11 // Regression test for https://github.com/llvm/llvm-project/issues/101960 where we used to
  12 // trigger an ambiguous constructor.
  13
  14 #include <complex>
  15 #include <cassert>
  16
  17 struct NastyConvertible {
  18   template <class T>
  19   operator T() const {
  20     return T(0);
  21   }
  22 };
  23
  24 template <class T>
  25 void test() {
  26   NastyConvertible nasty;
  27   std::complex<T> x(nasty, nasty);
  28   assert(x.real() == T(0));
  29   assert(x.imag() == T(0));
  30 }
  31
  32 int main(int, char**) {
  33   test<float>();
  34   test<double>();
  35   test<long double>();
  36
  37   return 0;
  38 }