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PR libstdc++/85965 move is_invocable assertions again

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This is another attempt to reduce how often the assertions are
evaluated, so that code which doesn't try to use the function objects
doesn't need them to be invocable.

For _Rb_tree we access the _M_key_compare object directly, so can't put
the assertions in an accessor function for it. However, every invocation
of _M_key_compare is accompanied by a use of _S_key, so the assertions
can be put in there.  For _Hashtable there are member functions that are
consistently used to obtain a hash code or test for equality, so the
assertions can go in those members.

	PR libstdc++/85965
	* include/bits/hashtable.h (_Hashtable::~_Hashtable()): Remove static
	assertions from the destructor.
	* include/bits/hashtable_policy.h (_Hash_code_base::_M_hash_code):
	Move static_assert for hash function to here.
	(_Hash_table_base::_M_equals): Move static_assert for equality
	predicate to here.
	* include/bits/stl_tree.h (_Rb_tree::_S_value(_Const_Link_type)):
	Remove.
	(_Rb_tree::_S_key(_Const_Link_type)): Move assertions here. Access
	the value directly instead of calling _S_value.
	(_Rb_tree::_S_value(_Const_Base_ptr)): Remove.
	(_Rb_tree::_S_key(_Const_Base_ptr)): Do downcast and forward to
	_S_key(_Const_Link_type).
	* testsuite/23_containers/set/85965.cc: Check construction,
	destruction, assignment and size() do not trigger the assertions.
	* testsuite/23_containers/unordered_set/85965.cc: Likewise.
	* testsuite/23_containers/map/48101_neg.cc: Call find and adjust
	expected errors.
	* testsuite/23_containers/multimap/48101_neg.cc: Likewise.
	* testsuite/23_containers/multiset/48101_neg.cc: Likewise.
	* testsuite/23_containers/set/48101_neg.cc: Likewise.
	* testsuite/23_containers/unordered_map/48101_neg.cc: Likewise.
	* testsuite/23_containers/unordered_multimap/48101_neg.cc: Likewise.
	* testsuite/23_containers/unordered_multiset/48101_neg.cc: Likewise.
	* testsuite/23_containers/unordered_set/48101_neg.cc: Likewise.

From-SVN: r271323
This commit is contained in:
Jonathan Wakely 2019-05-17 15:13:32 +01:00 committed by Jonathan Wakely
parent 8fd5cc193d
commit e625ccc21a
14 changed files with 101 additions and 33 deletions
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27
libstdc++-v3/ChangeLog
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@ -1,5 +1,32 @@
2019-05-17 Jonathan Wakely <jwakely@redhat.com>
PR libstdc++/85965
* include/bits/hashtable.h (_Hashtable::~_Hashtable()): Remove static
assertions from the destructor.
* include/bits/hashtable_policy.h (_Hash_code_base::_M_hash_code):
Move static_assert for hash function to here.
(_Hash_table_base::_M_equals): Move static_assert for equality
predicate to here.
* include/bits/stl_tree.h (_Rb_tree::_S_value(_Const_Link_type)):
Remove.
(_Rb_tree::_S_key(_Const_Link_type)): Move assertions here. Access
the value directly instead of calling _S_value.
(_Rb_tree::_S_value(_Const_Base_ptr)): Remove.
(_Rb_tree::_S_key(_Const_Base_ptr)): Do downcast and forward to
_S_key(_Const_Link_type).
* testsuite/23_containers/set/85965.cc: Check construction,
destruction, assignment and size() do not trigger the assertions.
* testsuite/23_containers/unordered_set/85965.cc: Likewise.
* testsuite/23_containers/map/48101_neg.cc: Call find and adjust
expected errors.
* testsuite/23_containers/multimap/48101_neg.cc: Likewise.
* testsuite/23_containers/multiset/48101_neg.cc: Likewise.
* testsuite/23_containers/set/48101_neg.cc: Likewise.
* testsuite/23_containers/unordered_map/48101_neg.cc: Likewise.
* testsuite/23_containers/unordered_multimap/48101_neg.cc: Likewise.
* testsuite/23_containers/unordered_multiset/48101_neg.cc: Likewise.
* testsuite/23_containers/unordered_set/48101_neg.cc: Likewise.
* include/bits/invoke.h [__cplusplus < 201703L] (__invoke_r<void>):
Use _GLIBCXX14_CONSTEXPR because void functions cannot be constexpr
in C++11.

6
libstdc++-v3/include/bits/hashtable.h
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@ -1351,12 +1351,6 @@ _GLIBCXX_BEGIN_NAMESPACE_VERSION
{
clear();
_M_deallocate_buckets();
static_assert(__is_invocable<const _H1&, const _Key&>{},
"hash function must be invocable with an argument of key type");
static_assert(__is_invocable<const _Equal&, const _Key&, const _Key&>{},
"key equality predicate must be invocable with two arguments of "
"key type");
}
template<typename _Key, typename _Value,

15
libstdc++-v3/include/bits/hashtable_policy.h
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@ -1283,7 +1283,11 @@ namespace __detail
__hash_code
_M_hash_code(const _Key& __k) const
{ return _M_h1()(__k); }
{
static_assert(__is_invocable<const _H1&, const _Key&>{},
"hash function must be invocable with an argument of key type");
return _M_h1()(__k);
}
std::size_t
_M_bucket_index(const _Key&, __hash_code __c, std::size_t __n) const
@ -1363,7 +1367,11 @@ namespace __detail
__hash_code
_M_hash_code(const _Key& __k) const
{ return _M_h1()(__k); }
{
static_assert(__is_invocable<const _H1&, const _Key&>{},
"hash function must be invocable with an argument of key type");
return _M_h1()(__k);
}
std::size_t
_M_bucket_index(const _Key&, __hash_code __c,
@ -1783,6 +1791,9 @@ namespace __detail
bool
_M_equals(const _Key& __k, __hash_code __c, __node_type* __n) const
{
static_assert(__is_invocable<const _Equal&, const _Key&, const _Key&>{},
"key equality predicate must be invocable with two arguments of "
"key type");
return _Equal_hash_code<__node_type>::_S_equals(__c, *__n)
&& _M_eq()(__k, this->_M_extract()(__n->_M_v()));
}

46
libstdc++-v3/include/bits/stl_tree.h
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@ -759,13 +759,27 @@ _GLIBCXX_BEGIN_NAMESPACE_VERSION
_M_end() const _GLIBCXX_NOEXCEPT
{ return &this->_M_impl._M_header; }
static const_reference
_S_value(_Const_Link_type __x)
{ return *__x->_M_valptr(); }
static const _Key&
_S_key(_Const_Link_type __x)
{ return _KeyOfValue()(_S_value(__x)); }
{
#if __cplusplus >= 201103L
// If we're asking for the key we're presumably using the comparison
// object, and so this is a good place to sanity check it.
static_assert(__is_invocable<_Compare&, const _Key&, const _Key&>{},
"comparison object must be invocable "
"with two arguments of key type");
# if __cplusplus >= 201703L
// _GLIBCXX_RESOLVE_LIB_DEFECTS
// 2542. Missing const requirements for associative containers
if constexpr (__is_invocable<_Compare&, const _Key&, const _Key&>{})
static_assert(
is_invocable_v<const _Compare&, const _Key&, const _Key&>,
"comparison object must be invocable as const");
# endif // C++17
#endif // C++11
return _KeyOfValue()(*__x->_M_valptr());
}
static _Link_type
_S_left(_Base_ptr __x) _GLIBCXX_NOEXCEPT
@ -783,13 +797,9 @@ _GLIBCXX_BEGIN_NAMESPACE_VERSION
_S_right(_Const_Base_ptr __x) _GLIBCXX_NOEXCEPT
{ return static_cast<_Const_Link_type>(__x->_M_right); }
static const_reference
_S_value(_Const_Base_ptr __x)
{ return *static_cast<_Const_Link_type>(__x)->_M_valptr(); }
static const _Key&
_S_key(_Const_Base_ptr __x)
{ return _KeyOfValue()(_S_value(__x)); }
{ return _S_key(static_cast<_Const_Link_type>(__x)); }
static _Base_ptr
_S_minimum(_Base_ptr __x) _GLIBCXX_NOEXCEPT
@ -974,21 +984,7 @@ _GLIBCXX_BEGIN_NAMESPACE_VERSION
#endif
~_Rb_tree() _GLIBCXX_NOEXCEPT
{
_M_erase(_M_begin());
#if __cplusplus >= 201103L
static_assert(__is_invocable<_Compare&, const _Key&, const _Key&>{},
"comparison object must be invocable "
"with two arguments of key type");
# if __cplusplus >= 201703L
// _GLIBCXX_RESOLVE_LIB_DEFECTS
// 2542. Missing const requirements for associative containers
static_assert(is_invocable_v<const _Compare&, const _Key&, const _Key&>,
"comparison object must be invocable as const");
# endif // C++17
#endif // C++11
}
{ _M_erase(_M_begin()); }
_Rb_tree&
operator=(const _Rb_tree& __x);

4
libstdc++-v3/testsuite/23_containers/map/48101_neg.cc
View File

@ -24,9 +24,13 @@ void
test01()
{
std::map<int, int, std::less<int*>> c;
c.find(1); // { dg-error "here" }
std::map<int, int, std::allocator<int>> c2;
c2.find(2); // { dg-error "here" }
}
// { dg-error "_Compare = std::less<int.>" "" { target *-*-* } 0 }
// { dg-error "_Compare = std::allocator<int>" "" { target *-*-* } 0 }
// { dg-error "comparison object must be invocable" "" { target *-*-* } 0 }
// { dg-prune-output "no match for call" }
// { dg-prune-output "invalid conversion" }

4
libstdc++-v3/testsuite/23_containers/multimap/48101_neg.cc
View File

@ -24,9 +24,13 @@ void
test01()
{
std::multimap<int, int, std::less<int*>> c;
c.find(1); // { dg-error "here" }
std::multimap<int, int, std::allocator<int>> c2;
c2.find(2); // { dg-error "here" }
}
// { dg-error "_Compare = std::less<int.>" "" { target *-*-* } 0 }
// { dg-error "_Compare = std::allocator<int>" "" { target *-*-* } 0 }
// { dg-error "comparison object must be invocable" "" { target *-*-* } 0 }
// { dg-prune-output "no match for call" }
// { dg-prune-output "invalid conversion" }

3
libstdc++-v3/testsuite/23_containers/multiset/48101_neg.cc
View File

@ -24,9 +24,12 @@ test01()
{
std::multiset<const int> c; // { dg-error "here" }
std::multiset<int, std::less<long*>> c2;
c2.find(2); // { dg-error "here" }
}
// { dg-error "non-const, non-volatile value_type" "" { target *-*-* } 0 }
// { dg-error "comparison object must be invocable" "" { target *-*-* } 0 }
// { dg-prune-output "std::allocator<.* has no member named " }
// { dg-prune-output "must have the same value_type as its allocator" }
// { dg-prune-output "no match for call" }
// { dg-prune-output "invalid conversion" }

3
libstdc++-v3/testsuite/23_containers/set/48101_neg.cc
View File

@ -24,9 +24,12 @@ test01()
{
std::set<const int> c; // { dg-error "here" }
std::set<int, std::less<long*>> c2;
c2.find(2); // { dg-error "here" }
}
// { dg-error "non-const, non-volatile value_type" "" { target *-*-* } 0 }
// { dg-error "comparison object must be invocable" "" { target *-*-* } 0 }
// { dg-prune-output "std::allocator<.* has no member named " }
// { dg-prune-output "must have the same value_type as its allocator" }
// { dg-prune-output "no match for call" }
// { dg-prune-output "invalid conversion" }

9
libstdc++-v3/testsuite/23_containers/set/85965.cc
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@ -27,3 +27,12 @@ struct Foo
// PR libstdc++/85965
std::set<Derived*, std::less<Base*>> s;
};
std::size_t
test01(std::set<Derived*, std::less<Base*>> s)
{
// these operations should not require the comparison object
auto copy = s;
copy = s;
return s.size();
}

2
libstdc++-v3/testsuite/23_containers/unordered_map/48101_neg.cc
View File

@ -24,8 +24,10 @@ test01()
{
using namespace std;
unordered_map<int, int, equal_to<int>, hash<int>> c2;
c2.find(2); // { dg-error "here" }
}
// { dg-error "hash function must be invocable" "" { target *-*-* } 0 }
// { dg-error "key equality predicate must be invocable" "" { target *-*-* } 0 }
// { dg-prune-output "use of deleted function" }
// { dg-prune-output "no match for call" }

2
libstdc++-v3/testsuite/23_containers/unordered_multimap/48101_neg.cc
View File

@ -24,8 +24,10 @@ test01()
{
using namespace std;
unordered_multimap<int, int, equal_to<int>, hash<int>> c2;
c2.find(2); // { dg-error "here" }
}
// { dg-error "hash function must be invocable" "" { target *-*-* } 0 }
// { dg-error "key equality predicate must be invocable" "" { target *-*-* } 0 }
// { dg-prune-output "use of deleted function" }
// { dg-prune-output "no match for call" }

2
libstdc++-v3/testsuite/23_containers/unordered_multiset/48101_neg.cc
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@ -25,6 +25,7 @@ test01()
using namespace std;
unordered_multiset<const int, hash<int>> c; // { dg-error "here" }
unordered_multiset<int, equal_to<int>, hash<int>> c2;
c2.find(2); // { dg-error "here" }
}
// { dg-error "non-const, non-volatile value_type" "" { target *-*-* } 0 }
@ -32,3 +33,4 @@ test01()
// { dg-error "key equality predicate must be invocable" "" { target *-*-* } 0 }
// { dg-prune-output "use of deleted function" }
// { dg-prune-output "must have the same value_type as its allocator" }
// { dg-prune-output "no match for call" }

2
libstdc++-v3/testsuite/23_containers/unordered_set/48101_neg.cc
View File

@ -25,6 +25,7 @@ test01()
using namespace std;
unordered_set<const int, hash<int>> c; // { dg-error "here" }
unordered_set<int, equal_to<int>, hash<int>> c2;
c2.find(2); // { dg-error "here" }
}
// { dg-error "non-const, non-volatile value_type" "" { target *-*-* } 0 }
@ -32,3 +33,4 @@ test01()
// { dg-error "key equality predicate must be invocable" "" { target *-*-* } 0 }
// { dg-prune-output "use of deleted function" }
// { dg-prune-output "must have the same value_type as its allocator" }
// { dg-prune-output "no match for call" }

9
libstdc++-v3/testsuite/23_containers/unordered_set/85965.cc
View File

@ -27,3 +27,12 @@ struct Foo
// PR libstdc++/85965
std::unordered_set<Derived*, std::equal_to<Base*>, std::hash<Base*>> u;
};
std::size_t
test01(std::unordered_set<Derived*, std::equal_to<Base*>, std::hash<Base*>> s)
{
// these operations should not require the comparison object
auto copy = s;
copy = s;
return s.size();
}