Difference between revisions of "cpp/experimental/lib extensions 3"
From cppreference.com
< cpp | experimental
m |
(→Feature test macros: LWG3649) |
||
| Line 17: | Line 17: | ||
===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}} and {{ltt|cpp/experimental/erased_type}} are supported }} | ||
{{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 guard are supported }} | {{dsc macro const | __cpp_lib_experimental_scope | nolink=true | a value of at least {{c|201902}} indicates that the scope guard 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}} | ||
Revision as of 17:11, 26 September 2022
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 version 1 and version 2.
std::experimental::make_array and components merged into C++17/20 are excluded from LFTS v3.
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) | |
Feature test macros
| Defined in header
<experimental/memory_resource> | |
| __cpp_lib_experimental_memory_resources |
a value of at least 201803 indicates that resource_adaptor and erased_type are supported (macro constant) |
| Defined in header
<experimental/scope> | |
| __cpp_lib_experimental_scope |
a value of at least 201902 indicates that the scope guard are supported (macro constant) |
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.
