GCC has support for the latest revision of the C++ standard, which was published in 2014.
C++14 features are available as part of "mainline" GCC
in the trunk of GCC's repository
and in GCC 4.8 and later. To enable C++14
support, add the command-line parameter -std=c++14
to your g++ command line. Or, to enable GNU
extensions in addition to C++14 extensions,
add -std=gnu++14.
Important: Because the final ISO C++14 standard was only recently published, GCC's support is experimental. No attempt will be made to maintain backward compatibility with implementations of C++14 features that do not reflect the final standard.
The following table lists new language features that are part of the C++14 standard. The "Proposal" column provides a link to the ISO C++ committee proposal that describes the feature, while the "Available in GCC?" column indicates the first version of GCC that contains an implementation of this feature (if it has been implemented).
| Language Feature | Proposal | Available in GCC? | SD-6 Feature Test |
|---|---|---|---|
| Tweak to certain C++ contextual conversions | N3323 | 4.9 | |
| Binary literals | N3472 |
4.3 (GNU)
4.9 (N3472) |
__cpp_binary_literals >= 201304 |
| Return type deduction for normal functions | N3638 |
4.8 (N3386)
4.9 (N3638) |
__cpp_decltype_auto >= 201304 |
| Generalized lambda capture (init-capture) | N3648 |
4.5 (partial)
4.9 (N3648) |
__cpp_init_captures >= 201304 |
| Generic (polymorphic) lambda expressions | N3649 | 4.9 | __cpp_generic_lambdas >= 201304 |
| Variable templates | N3651 | 5 | __cpp_variable_templates >= 201304 |
| Relaxing requirements on constexpr functions | N3652 | 5 | __cpp_constexpr >= 201304 |
| Member initializers and aggregates | N3653 | 5 | __cpp_aggregate_nsdmi >= 201304 |
| Clarifying memory allocation | N3664 | N/A | |
| Sized deallocation | N3778 | 5 | __cpp_sized_deallocation >= 201309 |
| [[deprecated]] attribute | N3760 | 4.9 (N3797) | __has_cpp_attribute(deprecated) >= 201309 |
| Single-quotation-mark as a digit separator | N3781 | 4.9 (N3797) | __cpp_digit_separator >= 201309 |
This feature was briefly part of the C++14 working paper, but was not part of the published standard; as a result, it has been removed from the compiler.
| Language Feature | Proposal | Available in GCC? | |
|---|---|---|---|
| Runtime-sized arrays with automatic storage duration
(Removed from the standard) |
N3639 | ?.? (GNU VLAs)
4.9 (N3639) 5 (GNU VLAs) |
__cpp_runtime_arrays >= 198712 |
The status of the library implementation can be tracked in this table.
Copyright (C) Free Software Foundation, Inc. Verbatim copying and distribution of this entire article is permitted in any medium, provided this notice is preserved.
These pages are maintained by the GCC team. Last modified 2015-11-14.