llvm/libcxx/test/std/utilities/allocator.adaptor/allocator.adaptor.members/construct.pass.cpp

//===----------------------------------------------------------------------===//
//
// 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

// <memory>

// template <class OuterAlloc, class... InnerAllocs>
//   class scoped_allocator_adaptor

// template <class T, class... Args> void construct(T* p, Args&&... args);

#include <scoped_allocator>
#include <cassert>
#include <string>

#include "test_macros.h"
#include "allocators.h"

struct B {
  static bool constructed;

  typedef A1<B> allocator_type;

  explicit B(std::allocator_arg_t, const allocator_type& a, int i) {
    assert(a.id() == 5);
    assert(i == 6);
    constructed = true;
  }
};

bool B::constructed = false;

struct C {
  static bool constructed;

  typedef std::scoped_allocator_adaptor<A2<C>> allocator_type;

  explicit C(std::allocator_arg_t, const allocator_type& a, int i) {
    assert(a.id() == 7);
    assert(i == 8);
    constructed = true;
  }
};

bool C::constructed = false;

struct D {
  static bool constructed;

  typedef std::scoped_allocator_adaptor<A2<D>> allocator_type;

  explicit D(int i, int j, const allocator_type& a) {
    assert(i == 1);
    assert(j == 2);
    assert(a.id() == 3);
    constructed = true;
  }
};

bool D::constructed = false;

struct E {
  static bool constructed;

  typedef std::scoped_allocator_adaptor<A1<E>> allocator_type;

  explicit E(int i, int j, const allocator_type& a) {
    assert(i == 1);
    assert(j == 2);
    assert(a.id() == 50);
    constructed = true;
  }
};

bool E::constructed = false;

struct F {
  static bool constructed;

  typedef std::scoped_allocator_adaptor<A2<F>> allocator_type;

  explicit F(int i, int j) {
    assert(i == 1);
    assert(j == 2);
  }

  explicit F(int i, int j, const allocator_type& a) {
    assert(i == 1);
    assert(j == 2);
    assert(a.id() == 50);
    constructed = true;
  }
};

bool F::constructed = false;

struct G {
  static bool constructed;

  typedef std::scoped_allocator_adaptor<std::allocator<G>> allocator_type;

  G(std::allocator_arg_t, allocator_type&&) { assert(false); }
  G(const allocator_type&) { constructed = true; }
};

bool G::constructed = false;

int main(int, char**) {
  {
    typedef std::scoped_allocator_adaptor<A1<std::string>> A;
    A a;
    char buf[100];
    typedef std::string S;
    S* s = (S*)buf;
    a.construct(s, 4, 'c');
    assert(*s == "cccc");
    s->~S();
  }

  {
    typedef std::scoped_allocator_adaptor<A1<B>> A;
    A a(A1<B>(5));
    char buf[100];
    typedef B S;
    S* s = (S*)buf;
    a.construct(s, 6);
    assert(S::constructed);
    s->~S();
  }

  {
    typedef std::scoped_allocator_adaptor<A1<int>, A2<C>> A;
    A a(A1<int>(5), A2<C>(7));
    char buf[100];
    typedef C S;
    S* s = (S*)buf;
    a.construct(s, 8);
    assert(S::constructed);
    s->~S();
  }

  {
    typedef std::scoped_allocator_adaptor<A1<int>, A2<D>> A;
    A a(A1<int>(5), A2<D>(3));
    char buf[100];
    typedef D S;
    S* s = (S*)buf;
    a.construct(s, 1, 2);
    assert(S::constructed);
    s->~S();
  }

  {
    typedef std::scoped_allocator_adaptor<A3<E>, A2<E>> K;
    typedef std::scoped_allocator_adaptor<K, A1<E>> A;
    A a(K(), A1<E>(50));
    char buf[100];
    typedef E S;
    S* s               = (S*)buf;
    A3<E>::constructed = false;
    a.construct(s, 1, 2);
    assert(S::constructed);
    assert(A3<E>::constructed);
    s->~S();
  }

  {
    typedef std::scoped_allocator_adaptor<A3<F>, A2<F>> K;
    typedef std::scoped_allocator_adaptor<K, A1<F>> A;
    A a(K(), A1<F>(50));
    char buf[100];
    typedef F S;
    S* s               = (S*)buf;
    A3<F>::constructed = false;
    a.construct(s, 1, 2);
    assert(!S::constructed);
    assert(A3<F>::constructed);
    s->~S();
  }

  // LWG 2586
  // Test that is_constructible uses an lvalue ref so the correct constructor
  // is picked.
  {
    G::allocator_type sa;
    G* ptr = sa.allocate(1);
    sa.construct(ptr);
    assert(G::constructed);
    sa.deallocate(ptr, 1);
  }

  return 0;
}