http://llvm.org/bugs/show_bug.cgi?id=17813
Bug ID: 17813
Summary: Class without default constructor, but with destructor
is not trivially constructible
Product: clang
Version: trunk
Hardware: PC
OS: All
Status: NEW
Severity: normal
Priority: P
Component: C++11
Assignee: [email protected]
Reporter: [email protected]
CC: [email protected], [email protected]
Classification: Unclassified
The following code does not compile with clang r193986:
struct Foo {
~Foo();
};
static_assert(__is_trivially_constructible(Foo), "");
static_assert(__has_trivial_constructor(Foo), "");
This results in:
% ~/LLVM/build/Release+Asserts/bin/clang -c -std=c++11 clang.cpp
clang.cpp:5:1: error: static_assert failed ""
static_assert(__is_trivially_constructible(Foo), "");
^ ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
1 error generated.
Removing the destructor makes the code compile.
This looks like an inconsistency between __is_trivially_constructible and
__has_trivial_constructor, the former of which are used by libc++'s
std::is_trivially_constructible type trait (the latter is only used if the
former is not available).
Also __is_trivially_constructible is influenced by the existence of a
destructor, despite §12.1p5 not mentioning destructors:
| A default constructor is trivial if it is not user-provided and if:
| — its class has no virtual functions (10.3) and no virtual base classes
| (10.1), and
| — no non-static data member of its class has a brace-or-equal-initializer,
| and
| — all the direct base classes of its class have trivial default constructors,
| and
| — for all the non-static data members of its class that are of class type
| (or array thereof), each such class has a trivial default constructor.
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