Make std::get constexpr

git-svn-id: https://llvm.org/svn/llvm-project/libcxx/trunk@186525 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Marshall Clow
2013-07-17 18:25:36 +00:00
parent f7777e8554
commit 8fc4f5a251
12 changed files with 299 additions and 51 deletions

View File

@@ -0,0 +1,62 @@
//===----------------------------------------------------------------------===//
//
// The LLVM Compiler Infrastructure
//
// This file is dual licensed under the MIT and the University of Illinois Open
// Source Licenses. See LICENSE.TXT for details.
//
//===----------------------------------------------------------------------===//
// <array>
// reference front();
// reference back();
// const_reference front(); // constexpr in C++14
// const_reference back(); // constexpr in C++14
#include <array>
#include <cassert>
int main()
{
{
typedef double T;
typedef std::array<T, 3> C;
C c = {1, 2, 3.5};
C::reference r1 = c.front();
assert(r1 == 1);
r1 = 5.5;
assert(c[0] == 5.5);
C::reference r2 = c.back();
assert(r2 == 3.5);
r2 = 7.5;
assert(c[2] == 7.5);
}
{
typedef double T;
typedef std::array<T, 3> C;
const C c = {1, 2, 3.5};
C::const_reference r1 = c.front();
assert(r1 == 1);
C::const_reference r2 = c.back();
assert(r2 == 3.5);
}
#if _LIBCPP_STD_VER > 11
{
typedef double T;
typedef std::array<T, 3> C;
constexpr C c = {1, 2, 3.5};
constexpr T t1 = c.front();
static_assert (t1 == 1, "");
constexpr T t2 = c.back();
static_assert (t2 == 3.5, "");
}
#endif
}