1 //===----------------------------------------------------------------------===//
2 //
3 //                     The LLVM Compiler Infrastructure
4 //
5 // This file is dual licensed under the MIT and the University of Illinois Open
6 // Source Licenses. See LICENSE.TXT for details.
7 //
8 //===----------------------------------------------------------------------===//
9 
10 // <cmath>
11 
12 // isnan
13 
14 // XFAIL: linux
15 
16 #include <cmath>
17 #include <type_traits>
18 #include <cassert>
19 
main()20 int main()
21 {
22 #ifdef isnan
23 #error isnan defined
24 #endif
25     static_assert((std::is_same<decltype(std::isnan((float)0)), bool>::value), "");
26     static_assert((std::is_same<decltype(std::isnan((double)0)), bool>::value), "");
27     static_assert((std::is_same<decltype(std::isnan(0)), bool>::value), "");
28     static_assert((std::is_same<decltype(std::isnan((long double)0)), bool>::value), "");
29     assert(std::isnan(-1.0) == false);
30 }
31