| // Copyright 2019-2024 The Khronos Group. This work is licensed under a |
| // Creative Commons Attribution 4.0 International License; see |
| // http://creativecommons.org/licenses/by/4.0/ |
| |
| [[diff2cxx]] |
| === Difference to {cpp} |
| |
| {cpp} for OpenCL supports the majority of standard {cpp}17 features, |
| however, there are some differences that are documented in this section. |
| |
| ==== Restrictions to {cpp} features |
| |
| The following {cpp} language features are not supported: |
| |
| * Virtual functions ({cpp}17 `[class.virtual]`); |
| * References to functions ({cpp}17 `[class.mfct]`); |
| * Pointers to class member functions (in addition to the regular non-member |
| functions that are already restricted in OpenCL C); |
| * Exceptions ({cpp}17 `[except]`); |
| * `dynamic_cast` operator ({cpp}17 `[expr.dynamic.cast]`); |
| * Non-placement `new`/`delete` operators ({cpp}17 |
| `[expr.new]`/`[expr.delete]`); |
| * `thread_local` storage class specifier ({cpp}17 `[basic.stc.thread]`); |
| * Standard C++ libraries ({cpp}17 `[library]`). |
| |
| :fn-feature-macro: footnote:[The macro belongs to the list of {cpp}20's \ |
| feature test macros.] |
| |
| Simultaneous initialization of static local objects performed by |
| different work-items is not guaranteed to be free from race-conditions. |
| Whether an implementation provides such a guarantee is indicated by the |
| presence of the `+__cpp_threadsafe_static_init+` feature test |
| macro{fn-feature-macro}. |
| |
| The list above only contains extra restrictions that are not detailed in OpenCL |
| C specification. As OpenCL restricts a number of C features, the same restrictions |
| are inherited by C++ for OpenCL. The detailed list of C feature restrictions |
| is provided in `OpenCL C 3.0 s6.11`. |
