//===----------------------------------------------------------------------===//
//
// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
// See https://llvm.org/LICENSE.txt for license information.
// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
//
//===----------------------------------------------------------------------===//
//
// 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 <map>
#include <cassert>
#include <iterator>
#include <tuple>
#include "test_macros.h"
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(int, char**)
{
{ // 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
}
return 0;
}
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