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Implement P0513R0 - "Poisoning the Hash"

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Summary:
Exactly what the title says.

This patch also adds a `std::hash<nullptr_t>` specialization in C++17, but it was not added by this paper and I can't find the actual paper that adds it.

See http://wg21.link/P0513R0 for more info.

If there are no comments in the next couple of days I'll commit this

Reviewers: mclow.lists, K-ballo, EricWF

Reviewed By: EricWF

Subscribers: cfe-commits

Differential Revision: https://reviews.llvm.org/D28938

git-svn-id: https://llvm.org/svn/llvm-project/libcxx/trunk@292684 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Eric Fiselier
2017-01-21 00:02:12 +00:00
parent ee856f131d
commit 952eaecfc6
31 changed files with 1470 additions and 653 deletions
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27
test/std/strings/string.view/string.view.hash/string_view.pass.cpp
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@@ -19,29 +19,38 @@
// Not very portable
#include <string_view>
#include <string>
#include <cassert>
#include <type_traits>
using std::string_view;
template <class T>
template <class SV>
void
test()
{
typedef std::hash<T> H;
static_assert((std::is_same<typename H::argument_type, T>::value), "" );
typedef std::hash<SV> H;
static_assert((std::is_same<typename H::argument_type, SV>::value), "" );
static_assert((std::is_same<typename H::result_type, std::size_t>::value), "" );
H h;
// std::string g1 = "1234567890";
// std::string g2 = "1234567891";
typedef typename T::value_type char_type;
typedef typename SV::value_type char_type;
typedef std::basic_string<char_type> String;
typedef std::hash<String> SH;
char_type g1 [ 10 ];
char_type g2 [ 10 ];
for ( int i = 0; i < 10; ++i )
g1[i] = g2[9-i] = static_cast<char_type>('0' + i);
T s1(g1, 10);
T s2(g2, 10);
H h;
SH sh;
SV s1(g1, 10);
String ss1(s1);
SV s2(g2, 10);
String ss2(s2);
assert(h(s1) == h(s1));
assert(h(s1) != h(s2));
assert(sh(ss1) == h(s1));
assert(sh(ss2) == h(s2));
}
int main()