C++ standard libraries extensions, version 3
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< cpp | experimental
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.
