| Line | Branch | Exec | Source |
|---|---|---|---|
| 1 | // | ||
| 2 | // Copyright (c) 2019 Vinnie Falco (vinnie.falco@gmail.com) | ||
| 3 | // | ||
| 4 | // Distributed under the Boost Software License, Version 1.0. (See accompanying | ||
| 5 | // file LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt) | ||
| 6 | // | ||
| 7 | // Official repository: https://github.com/boostorg/json | ||
| 8 | // | ||
| 9 | |||
| 10 | #ifndef BOOST_JSON_IMPL_NULL_RESOURCE_IPP | ||
| 11 | #define BOOST_JSON_IMPL_NULL_RESOURCE_IPP | ||
| 12 | |||
| 13 | #include <boost/json/null_resource.hpp> | ||
| 14 | #include <boost/throw_exception.hpp> | ||
| 15 | |||
| 16 | namespace boost { | ||
| 17 | namespace json { | ||
| 18 | |||
| 19 | namespace detail { | ||
| 20 | |||
| 21 | /** A resource which always fails. | ||
| 22 | |||
| 23 | This memory resource always throws the exception | ||
| 24 | `std::bad_alloc` in calls to `allocate`. | ||
| 25 | */ | ||
| 26 | class null_resource final | ||
| 27 | : public container::pmr::memory_resource | ||
| 28 | { | ||
| 29 | public: | ||
| 30 | /// Copy constructor (deleted) | ||
| 31 | null_resource( | ||
| 32 | null_resource const&) = delete; | ||
| 33 | |||
| 34 | /// Copy assignment (deleted) | ||
| 35 | null_resource& operator=( | ||
| 36 | null_resource const&) = delete; | ||
| 37 | |||
| 38 | /** Constructor | ||
| 39 | |||
| 40 | This constructs the resource. | ||
| 41 | |||
| 42 | @par Complexity | ||
| 43 | Constant. | ||
| 44 | |||
| 45 | @par Exception Safety | ||
| 46 | No-throw guarantee. | ||
| 47 | */ | ||
| 48 | /** @{ */ | ||
| 49 | null_resource() noexcept = default; | ||
| 50 | |||
| 51 | protected: | ||
| 52 | void* | ||
| 53 | 3 | do_allocate( | |
| 54 | std::size_t, | ||
| 55 | std::size_t) override | ||
| 56 | { | ||
| 57 | 6 | throw_exception( std::bad_alloc(), BOOST_CURRENT_LOCATION ); | |
| 58 | } | ||
| 59 | |||
| 60 | void | ||
| 61 | 1 | do_deallocate( | |
| 62 | void*, | ||
| 63 | std::size_t, | ||
| 64 | std::size_t) override | ||
| 65 | { | ||
| 66 | // do nothing | ||
| 67 | 1 | } | |
| 68 | |||
| 69 | bool | ||
| 70 | ✗ | do_is_equal( | |
| 71 | memory_resource const& mr | ||
| 72 | ) const noexcept override | ||
| 73 | { | ||
| 74 | ✗ | return this == &mr; | |
| 75 | } | ||
| 76 | }; | ||
| 77 | |||
| 78 | } // detail | ||
| 79 | |||
| 80 | container::pmr::memory_resource* | ||
| 81 | 10 | get_null_resource() noexcept | |
| 82 | { | ||
| 83 |
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10 | static detail::null_resource mr; |
| 84 | 10 | return &mr; | |
| 85 | } | ||
| 86 | |||
| 87 | } // namespace json | ||
| 88 | } // namespace boost | ||
| 89 | |||
| 90 | #endif | ||
| 91 |