Mercurial > hg > CbC > CbC_gcc
view gcc/testsuite/g++.dg/cpp0x/constexpr-decltype3.C @ 145:1830386684a0
gcc-9.2.0
author | anatofuz |
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date | Thu, 13 Feb 2020 11:34:05 +0900 |
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// PR c++/88815 // { dg-do compile { target c++11 } } struct true_type { constexpr operator bool() const { return true; } }; struct false_type { constexpr operator bool() const { return false; } }; template<int (*p)()> true_type is_constexpr_impl(decltype(int{(p(), 0U)})); template<int (*p)()> false_type is_constexpr_impl(...); template<int (*p)()> using is_constexpr = decltype(is_constexpr_impl<p>(0)); constexpr int f() { return 0; } int g() { return 0; } static_assert(is_constexpr<f>(), ""); static_assert(!is_constexpr<g>(), "");