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<th>Bug ID</th>
<td><a class="bz_bug_link
bz_status_NEW "
title="NEW - is_trivial not always equal to is_trivially_default_constructible && is_trivially_copyable"
href="https://bugs.llvm.org/show_bug.cgi?id=51054">51054</a>
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<th>Summary</th>
<td>is_trivial not always equal to is_trivially_default_constructible && is_trivially_copyable
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<th>Product</th>
<td>clang
</td>
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<th>Version</th>
<td>trunk
</td>
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<th>Hardware</th>
<td>PC
</td>
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<th>OS</th>
<td>Linux
</td>
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<th>Status</th>
<td>NEW
</td>
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<th>Severity</th>
<td>normal
</td>
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<th>Priority</th>
<td>P
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<th>Component</th>
<td>C++
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<th>Assignee</th>
<td>unassignedclangbugs@nondot.org
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<th>Reporter</th>
<td>oliverzlee@gmail.com
</td>
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<th>CC</th>
<td>blitzrakete@gmail.com, dgregor@apple.com, erik.pilkington@gmail.com, llvm-bugs@lists.llvm.org, richard-llvm@metafoo.co.uk
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<pre>std::is_trivial_v<T> can be false when both
std::is_trivially_default_constructible_v<T> and
std::is_trivially_copyable_v<T> are true.
-----
#include <array>
#include <type_traits>
template <class T>
struct S
{
std::array<T, 3> data;
S() = default;
template <class... Args, class = typename std::enable_if<sizeof...(Args) ==
3>::type>
constexpr S(Args... args) : data{args...} {}
};
static_assert(std::is_trivially_default_constructible<S<int>>::value, "");
static_assert(std::is_trivially_copyable<S<int>>::value, "");
static_assert(std::is_trivial<S<int>>::value, "");
----
Compiler explorer link: <a href="https://godbolt.org/z/Wczr1vPhb">https://godbolt.org/z/Wczr1vPhb</a>
This builds successfully with GCC and Clang 10.x and earlier with C++11/14/17.</pre>
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