Mercurial > hg > CbC > CbC_gcc
view gcc/testsuite/g++.dg/cpp1y/constexpr-array3.C @ 131:84e7813d76e9
gcc-8.2
author | mir3636 |
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date | Thu, 25 Oct 2018 07:37:49 +0900 |
parents | 04ced10e8804 |
children |
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// PR c++/69995 // { dg-do compile { target c++14 } } #define assert(X) static_assert((X),#X) #define CONSTEXPR constexpr template <typename T, unsigned long Size> struct array { T elems_[Size]; constexpr T const& operator[](unsigned long n) const { return elems_[n]; } constexpr T& operator[](unsigned long n) { return elems_[n]; } }; template <typename T> CONSTEXPR void my_swap(T& a, T& b) { T tmp = a; a = b; b = tmp; } CONSTEXPR auto rotate2() { array<array<int, 2>, 2> result{}; array<int, 2> a{{0, 1}}; result[0] = a; my_swap(a[0], a[1]); result[1] = a; return result; } int main() { CONSTEXPR auto indices = rotate2(); assert(indices[0][0] == 0); assert(indices[0][1] == 1); assert(indices[1][0] == 1); assert(indices[1][1] == 0); }