192622dc49
The standard isn't exactly clear how std::array should handle zero-sized arrays with const element types. In particular W.R.T. copy assignment, swap, and fill. This patch takes the position that those operations should be ill-formed, and makes changes to libc++ to make it so. This follows up on commit r324182. llvm-svn: 324185
58 lines
1.4 KiB
C++
58 lines
1.4 KiB
C++
//===----------------------------------------------------------------------===//
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//
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// The LLVM Compiler Infrastructure
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//
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// This file is dual licensed under the MIT and the University of Illinois Open
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// Source Licenses. See LICENSE.TXT for details.
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//
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//===----------------------------------------------------------------------===//
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// <array>
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// T *data();
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#include <array>
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#include <cassert>
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// std::array is explicitly allowed to be initialized with A a = { init-list };.
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// Disable the missing braces warning for this reason.
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#include "disable_missing_braces_warning.h"
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int main()
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{
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{
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typedef double T;
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typedef std::array<T, 3> C;
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C c = {1, 2, 3.5};
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T* p = c.data();
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assert(p[0] == 1);
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assert(p[1] == 2);
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assert(p[2] == 3.5);
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}
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{
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typedef double T;
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typedef std::array<T, 0> C;
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C c = {};
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T* p = c.data();
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(void)p; // to placate scan-build
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}
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{
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typedef double T;
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typedef std::array<const T, 0> C;
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C c = {};
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const T* p = c.data();
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static_assert((std::is_same<decltype(c.data()), const T*>::value), "");
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(void)p; // to placate scan-build
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}
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{
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struct NoDefault {
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NoDefault(int) {}
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};
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typedef NoDefault T;
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typedef std::array<T, 0> C;
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C c = {};
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T* p = c.data();
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assert(p != nullptr);
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}
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}
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