1//===----------------------------------------------------------------------===//
2//
3// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
4// See https://llvm.org/LICENSE.txt for license information.
5// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
6//
7//===----------------------------------------------------------------------===//
8
9// UNSUPPORTED: c++03, c++11, c++14
10// TODO: Change to XFAIL once https://github.com/llvm/llvm-project/issues/40340 is fixed
11// UNSUPPORTED: availability-pmr-missing
12
13// <memory_resource>
14
15// class monotonic_buffer_resource
16
17#include <memory_resource>
18#include <cassert>
19
20#include "count_new.h"
21#include "test_macros.h"
22
23int main(int, char**) {
24 globalMemCounter.reset();
25 char buffer[100];
26 auto mono1 = std::pmr::monotonic_buffer_resource(buffer, sizeof buffer, std::pmr::new_delete_resource());
27 std::pmr::memory_resource& r1 = mono1;
28
29 // Check that construction with a buffer does not allocate anything from the upstream
30 assert(globalMemCounter.checkNewCalledEq(0));
31
32 // Check that an allocation that fits in the buffer does not allocate anything from the upstream
33 void* ret = r1.allocate(bytes: 50);
34 assert(ret);
35 assert(globalMemCounter.checkNewCalledEq(0));
36
37 // Check a second allocation
38 ret = r1.allocate(bytes: 20);
39 assert(ret);
40 assert(globalMemCounter.checkNewCalledEq(0));
41
42 r1.deallocate(p: ret, bytes: 50);
43 assert(globalMemCounter.checkDeleteCalledEq(0));
44
45 // Check an allocation that doesn't fit in the original buffer
46 ret = r1.allocate(bytes: 50);
47 assert(ret);
48 ASSERT_WITH_LIBRARY_INTERNAL_ALLOCATIONS(globalMemCounter.checkNewCalledEq(1));
49
50 r1.deallocate(p: ret, bytes: 50);
51 assert(globalMemCounter.checkDeleteCalledEq(0));
52
53 mono1.release();
54 ASSERT_WITH_LIBRARY_INTERNAL_ALLOCATIONS(globalMemCounter.checkDeleteCalledEq(1));
55 assert(globalMemCounter.checkOutstandingNewEq(0));
56
57 return 0;
58}
59

source code of libcxx/test/std/utilities/utility/mem.res/mem.res.monotonic.buffer/mem.res.monotonic.buffer.mem/allocate_from_initial_buffer.pass.cpp