Implement N4279 and LWG#2664 for <map>. Reviewed as http://reviews.llvm.org/D10669

llvm-svn: 241539

1 files changed, 189 insertions, 0 deletions

diff --git a/libcxx/test/std/containers/associative/map/map.modifiers/try.emplace.pass.cpp b/libcxx/test/std/containers/associative/map/map.modifiers/try.emplace.pass.cpp
new file mode 100644
index 00000000000..8e0dd7577bb
--- /dev/null
+++ b/libcxx/test/std/containers/associative/map/map.modifiers/try.emplace.pass.cpp
@@ -0,0 +1,189 @@
+//===----------------------------------------------------------------------===//
+//
+//                     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.
+//
+//===----------------------------------------------------------------------===//
+//
+// UNSUPPORTED: c++03, c++11, c++14
+
+// <map>
+
+// class map
+
+// template <class... Args>
+//  pair<iterator, bool> try_emplace(const key_type& k, Args&&... args);          // C++17
+// template <class... Args>
+//  pair<iterator, bool> try_emplace(key_type&& k, Args&&... args);               // C++17
+// template <class... Args>
+//  iterator try_emplace(const_iterator hint, const key_type& k, Args&&... args); // C++17
+// template <class... Args>
+//  iterator try_emplace(const_iterator hint, key_type&& k, Args&&... args);      // C++17
+
+#include <__config>
+#include <map>
+#include <cassert>
+#include <tuple>
+
+class Moveable
+{
+    Moveable(const Moveable&);
+    Moveable& operator=(const Moveable&);
+
+    int int_;
+    double double_;
+public:
+    Moveable() : int_(0), double_(0) {}
+    Moveable(int i, double d) : int_(i), double_(d) {}
+    Moveable(Moveable&& x)
+        : int_(x.int_), double_(x.double_)
+            {x.int_ = -1; x.double_ = -1;}
+    Moveable& operator=(Moveable&& x)
+        {int_ = x.int_; x.int_ = -1;
+         double_ = x.double_; x.double_ = -1;
+         return *this;
+        }
+
+    bool operator==(const Moveable& x) const
+        {return int_ == x.int_ && double_ == x.double_;}
+    bool operator<(const Moveable& x) const
+        {return int_ < x.int_ || (int_ == x.int_ && double_ < x.double_);}
+
+    int get() const {return int_;}
+    bool moved() const {return int_ == -1;}
+};
+
+
+int main()
+{
+#ifndef _LIBCPP_HAS_NO_RVALUE_REFERENCES
+#ifndef _LIBCPP_HAS_NO_VARIADICS
+
+    { // pair<iterator, bool> try_emplace(const key_type& k, Args&&... args);
+        typedef std::map<int, Moveable> M;
+        typedef std::pair<M::iterator, bool> R;
+        M m;
+        R r;
+        for (int i = 0; i < 20; i += 2)
+            m.emplace (i, Moveable(i, (double) i));
+        assert(m.size() == 10);
+
+        Moveable mv1(3, 3.0);
+        for (int i=0; i < 20; i += 2)
+        {
+            r = m.try_emplace(i, std::move(mv1));
+            assert(m.size() == 10);
+            assert(!r.second);              // was not inserted
+            assert(!mv1.moved());           // was not moved from
+            assert(r.first->first == i);    // key
+        }
+
+        r = m.try_emplace(-1, std::move(mv1));
+        assert(m.size() == 11);
+        assert(r.second);                   // was inserted
+        assert(mv1.moved());                // was moved from
+        assert(r.first->first == -1);       // key
+        assert(r.first->second.get() == 3); // value
+
+        Moveable mv2(5, 3.0);
+        r = m.try_emplace(5, std::move(mv2));
+        assert(m.size() == 12);
+        assert(r.second);                   // was inserted
+        assert(mv2.moved());                // was moved from
+        assert(r.first->first == 5);        // key
+        assert(r.first->second.get() == 5); // value
+
+        Moveable mv3(-1, 3.0);
+        r = m.try_emplace(117, std::move(mv2));
+        assert(m.size() == 13);
+        assert(r.second);                    // was inserted
+        assert(mv2.moved());                 // was moved from
+        assert(r.first->first == 117);       // key
+        assert(r.first->second.get() == -1); // value
+    }
+
+    {  // pair<iterator, bool> try_emplace(key_type&& k, Args&&... args); 
+        typedef std::map<Moveable, Moveable> M;
+        typedef std::pair<M::iterator, bool> R;
+        M m;
+        R r;
+        for ( int i = 0; i < 20; i += 2 )
+            m.emplace ( Moveable(i, (double) i), Moveable(i+1, (double) i+1));
+        assert(m.size() == 10);
+
+        Moveable mvkey1(2, 2.0);
+        Moveable mv1(4, 4.0);
+        r = m.try_emplace(std::move(mvkey1), std::move(mv1));
+        assert(m.size() == 10);
+        assert(!r.second);                 // was not inserted
+        assert(!mv1.moved());              // was not moved from
+        assert(!mvkey1.moved());           // was not moved from
+        assert(r.first->first == mvkey1);  // key
+
+        Moveable mvkey2(3, 3.0);
+        r = m.try_emplace(std::move(mvkey2), std::move(mv1));
+        assert(m.size() == 11);
+        assert(r.second);                   // was inserted
+        assert(mv1.moved());                // was moved from
+        assert(mvkey2.moved());             // was moved from
+        assert(r.first->first.get()  == 3); // key
+        assert(r.first->second.get() == 4); // value
+    }
+
+    {  // iterator try_emplace(const_iterator hint, const key_type& k, Args&&... args);
+        typedef std::map<int, Moveable> M;
+        M m;
+        M::iterator r;
+        for ( int i = 0; i < 20; i += 2 )
+            m.try_emplace ( i, Moveable(i, (double) i));
+        assert(m.size() == 10);
+        M::const_iterator it = m.find(2);
+        
+        Moveable mv1(3, 3.0);
+        for (int i=0; i < 20; i += 2)
+        {
+            r = m.try_emplace(it, i, std::move(mv1));
+            assert(m.size() == 10);
+            assert(!mv1.moved());         // was not moved from
+            assert(r->first == i);        // key
+            assert(r->second.get() == i); // value
+        }
+
+        r = m.try_emplace(it, 3, std::move(mv1));
+        assert(m.size() == 11);
+        assert(mv1.moved());          // was moved from
+        assert(r->first == 3);        // key
+        assert(r->second.get() == 3); // value
+    }
+
+    {  // iterator try_emplace(const_iterator hint, key_type&& k, Args&&... args);
+        typedef std::map<Moveable, Moveable> M;
+        M m;
+        M::iterator r;
+        for ( int i = 0; i < 20; i += 2 )
+            m.emplace ( Moveable(i, (double) i), Moveable(i+1, (double) i+1));
+        assert(m.size() == 10);
+        M::const_iterator it = std::next(m.cbegin());
+
+        Moveable mvkey1(2, 2.0);
+        Moveable mv1(4, 4.0);
+        r = m.try_emplace(it, std::move(mvkey1), std::move(mv1));
+        assert(m.size() == 10);
+        assert(!mv1.moved());        // was not moved from
+        assert(!mvkey1.moved());     // was not moved from
+        assert(r->first == mvkey1);  // key
+
+        Moveable mvkey2(3, 3.0);
+        r = m.try_emplace(it, std::move(mvkey2), std::move(mv1));
+        assert(m.size() == 11);
+        assert(mv1.moved());          // was moved from
+        assert(mvkey2.moved());       // was moved from
+        assert(r->first.get()  == 3); // key
+        assert(r->second.get() == 4); // value
+    }
+
+#endif  // _LIBCPP_HAS_NO_VARIADICS
+#endif  // _LIBCPP_HAS_NO_RVALUE_REFERENCES
+}