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After sleeping on it I've decided that all special members that can be noexcept, should be declared so. The client has the traits to detect and branch on this information, and it is often an important optimization. Give deque() a noexcept. Add test for deque default constructor and deque destructor.

Browse Source 
git-svn-id: https://llvm.org/svn/llvm-project/libcxx/trunk@132549 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Howard Hinnant 2011-06-03 15:16:49 +00:00
parent 93f2764b16
commit 009b2c4583
4 changed files with 109 additions and 4 deletions
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4
include/__split_buffer
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@ -52,7 +52,8 @@ public:
_LIBCPP_INLINE_VISIBILITY pointer& __end_cap() _NOEXCEPT {return __end_cap_.first();}
_LIBCPP_INLINE_VISIBILITY const pointer& __end_cap() const _NOEXCEPT {return __end_cap_.first();}
__split_buffer();
__split_buffer()
_NOEXCEPT_(is_nothrow_default_constructible<allocator_type>::value);
explicit __split_buffer(__alloc_rr& __a);
explicit __split_buffer(const __alloc_rr& __a);
__split_buffer(size_type __cap, size_type __start, __alloc_rr& __a);
@ -323,6 +324,7 @@ __split_buffer<_Tp, _Allocator>::__split_buffer(size_type __cap, size_type __sta
template <class _Tp, class _Allocator>
_LIBCPP_INLINE_VISIBILITY inline
__split_buffer<_Tp, _Allocator>::__split_buffer()
_NOEXCEPT_(is_nothrow_default_constructible<allocator_type>::value)
: __first_(0), __begin_(0), __end_(0), __end_cap_(0)
{
}

11
include/deque
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@ -38,7 +38,7 @@ public:
typedef std::reverse_iterator<const_iterator> const_reverse_iterator;
// construct/copy/destroy:
deque();
deque() noexcept(is_nothrow_default_constructible<allocator_type>::value);
explicit deque(const allocator_type& a);
explicit deque(size_type n);
deque(size_type n, const value_type& v);
@ -934,7 +934,8 @@ protected:
_LIBCPP_INLINE_VISIBILITY
const allocator_type& __alloc() const _NOEXCEPT {return __size_.second();}
__deque_base();
__deque_base()
_NOEXCEPT_(is_nothrow_default_constructible<allocator_type>::value);
explicit __deque_base(const allocator_type& __a);
public:
~__deque_base();
@ -1072,6 +1073,7 @@ __deque_base<_Tp, _Allocator>::end() const _NOEXCEPT
template <class _Tp, class _Allocator>
inline _LIBCPP_INLINE_VISIBILITY
__deque_base<_Tp, _Allocator>::__deque_base()
_NOEXCEPT_(is_nothrow_default_constructible<allocator_type>::value)
: __start_(0), __size_(0) {}
template <class _Tp, class _Allocator>
@ -1185,7 +1187,10 @@ public:
typedef _STD::reverse_iterator<const_iterator> const_reverse_iterator;
// construct/copy/destroy:
_LIBCPP_INLINE_VISIBILITY deque() {}
_LIBCPP_INLINE_VISIBILITY
deque()
_NOEXCEPT_(is_nothrow_default_constructible<allocator_type>::value)
{}
_LIBCPP_INLINE_VISIBILITY deque(const allocator_type& __a) : __base(__a) {}
explicit deque(size_type __n);
deque(size_type __n, const value_type& __v);

50
test/containers/sequences/deque/deque.cons/default_noexcept.pass.cpp Normal file
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@ -0,0 +1,50 @@
//===----------------------------------------------------------------------===//
//
// 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.
//
//===----------------------------------------------------------------------===//
// <deque>
// deque()
// noexcept(is_nothrow_default_constructible<allocator_type>::value);
// This tests a conforming extension
#include <deque>
#include <cassert>
#include "../../../MoveOnly.h"
#include "../../../test_allocator.h"
template <class T>
struct some_alloc
{
typedef T value_type;
some_alloc(const some_alloc&);
};
int main()
{
#if __has_feature(cxx_noexcept)
{
typedef std::deque<MoveOnly> C;
static_assert(std::is_nothrow_default_constructible<C>::value, "");
}
{
typedef std::deque<MoveOnly, test_allocator<MoveOnly>> C;
static_assert(std::is_nothrow_default_constructible<C>::value, "");
}
{
typedef std::deque<MoveOnly, other_allocator<MoveOnly>> C;
static_assert(!std::is_nothrow_default_constructible<C>::value, "");
}
{
typedef std::deque<MoveOnly, some_alloc<MoveOnly>> C;
static_assert(!std::is_nothrow_default_constructible<C>::value, "");
}
#endif
}

48
test/containers/sequences/deque/deque.cons/dtor_noexcept.pass.cpp Normal file
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@ -0,0 +1,48 @@
//===----------------------------------------------------------------------===//
//
// 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.
//
//===----------------------------------------------------------------------===//
// <deque>
// ~deque() // implied noexcept;
#include <deque>
#include <cassert>
#include "../../../MoveOnly.h"
#include "../../../test_allocator.h"
template <class T>
struct some_alloc
{
typedef T value_type;
some_alloc(const some_alloc&);
~some_alloc() noexcept(false);
};
int main()
{
#if __has_feature(cxx_noexcept)
{
typedef std::deque<MoveOnly> C;
static_assert(std::is_nothrow_destructible<C>::value, "");
}
{
typedef std::deque<MoveOnly, test_allocator<MoveOnly>> C;
static_assert(std::is_nothrow_destructible<C>::value, "");
}
{
typedef std::deque<MoveOnly, other_allocator<MoveOnly>> C;
static_assert(std::is_nothrow_destructible<C>::value, "");
}
{
typedef std::deque<MoveOnly, some_alloc<MoveOnly>> C;
static_assert(!std::is_nothrow_destructible<C>::value, "");
}
#endif
}