Difference between revisions of "cpp/experimental/lib extensions 3"
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{{cpp/experimental/lib_extensions_3/navbar}} | {{cpp/experimental/lib_extensions_3/navbar}} | ||
| − | Version 3 of the C++ Extensions for Library Fundamentals, defines the following new components for the C++ standard library, in addition to those defined in [[cpp/experimental/lib extensions|version 1]] and [[cpp/experimental/lib extensions 2|version 2]]. Components merged into C++17 are | + | Version 3 of the C++ Extensions for Library Fundamentals, ISO/IEC TS 19568:2024, defines the following new components for the C++ standard library, in addition to those defined in [[cpp/experimental/lib extensions|version 1]] and [[cpp/experimental/lib extensions 2|version 2]]. |
| + | |||
| + | Components merged into C++17/20 and the following components are removed in LFTS v3: | ||
| + | * {{lc|std::experimental::make_array}}, | ||
| + | * {{lc|std::experimental::erased_type}}, | ||
| + | * {{ltt|cpp/experimental/lib_extensions/packaged_task|std::experimental::packaged_task}}, and | ||
| + | * {{ltt|cpp/experimental/lib_extensions/promise|std::experimental::promise}}. | ||
===Scope guard=== | ===Scope guard=== | ||
| Line 10: | Line 16: | ||
{{dsc inc | cpp/experimental/dsc scope_fail}} | {{dsc inc | cpp/experimental/dsc scope_fail}} | ||
{{dsc inc | cpp/experimental/dsc scope_success}} | {{dsc inc | cpp/experimental/dsc scope_success}} | ||
| − | {{dsc | + | {{dsc inc | cpp/experimental/dsc unique_resource}} |
{{dsc end}} | {{dsc end}} | ||
===Feature test macros=== | ===Feature test macros=== | ||
{{dsc begin}} | {{dsc begin}} | ||
| + | {{dsc header | experimental/memory_resource }} | ||
| + | {{dsc macro const | __cpp_lib_experimental_memory_resources | nolink=true | a value of at least {{c|201803}} indicates that {{ltt|cpp/experimental/resource_adaptor}} is supported }} | ||
| + | {{dsc header | experimental/functional }} | ||
| + | {{dsc macro const | __cpp_lib_experimental_function_polymorphic_allocator | nolink=true | a value of at least {{c|202211}} indicates that {{c|std::pmr::polymorphic_allocator<>}} is used for {{ltt|cpp/experimental/function|std::experimental::function}} }} | ||
{{dsc header | experimental/scope}} | {{dsc header | experimental/scope}} | ||
| − | {{dsc macro const | __cpp_lib_experimental_scope | nolink=true | a value of at least {{c|201902}} indicates that the scope | + | {{dsc macro const | __cpp_lib_experimental_scope | nolink=true | a value of at least {{c|201902}} indicates that the scope guards are supported }} |
{{dsc end}} | {{dsc end}} | ||
| − | {{langlinks|ja|zh}} | + | ===Notes=== |
| + | The value of {{tt|__cpp_lib_experimental_memory_resources}} has been increased in LFTS v3, because the design of {{ltt|cpp/experimental/resource_adaptor}} is rebased onto {{lc|std::pmr::memory_resource}}. | ||
| + | |||
| + | {{langlinks|de|es|fr|it|ja|pt|ru|zh}} | ||
Latest revision as of 00:23, 6 November 2024
Version 3 of the C++ Extensions for Library Fundamentals, ISO/IEC TS 19568:2024, defines the following new components for the C++ standard library, in addition to those defined in version 1 and version 2.
Components merged into C++17/20 and the following components are removed in LFTS v3:
- std::experimental::make_array,
- std::experimental::erased_type,
- std::experimental::packaged_task, and
- std::experimental::promise.
[edit] Scope guard
| Defined in header
<experimental/scope> | |
| wraps a function object and invokes it on exiting the scope (class template) | |
| wraps a function object and invokes it on exiting the scope through an exception (class template) | |
| wraps a function object and invokes it on exiting the scope normally (class template) | |
| universal RAII resource handle wrapper (class template) | |
[edit] Feature test macros
| Defined in header
<experimental/memory_resource> | |
| __cpp_lib_experimental_memory_resources |
a value of at least 201803 indicates that resource_adaptor is supported (macro constant) |
| Defined in header
<experimental/functional> | |
| __cpp_lib_experimental_function_polymorphic_allocator |
a value of at least 202211 indicates that std::pmr::polymorphic_allocator<> is used for std::experimental::function (macro constant) |
| Defined in header
<experimental/scope> | |
| __cpp_lib_experimental_scope |
a value of at least 201902 indicates that the scope guards are supported (macro constant) |
[edit] Notes
The value of __cpp_lib_experimental_memory_resources has been increased in LFTS v3, because the design of resource_adaptor is rebased onto std::pmr::memory_resource.
