Templates for fundamental properties of types
The Boost type-traits library contains a set of very specific traits classes, each of which encapsulate a single trait
from the C++ type system; for example, is a type a pointer or a reference type? Or does a type have a trivial constructor, or a const-qualifier?
The type-traits classes share a unified design: each class inherits from the type true_type if the type has the specified property and inherits from false_type otherwise.
The type-traits library also contains a set of classes that perform a specific transformation on a type; for example, they can remove a top-level const or
volatile qualifier from a type. Each class that performs a transformation defines a single typedef-member type that is the result of the transformation.
The full documentation is available on boost.org.
|
Master |
Develop |
Travis |
 |
 |
Appveyor |
 |
 |
Support, bugs and feature requests
Bugs and feature requests can be reported through the Gitub issue tracker
(see open issues and
closed issues).
You can submit your changes through a pull request.
There is no mailing-list specific to Boost TypeTraits, although you can use the general-purpose Boost mailing-list using the tag [type_traits].
Development
Clone the whole boost project, which includes the individual Boost projects as submodules (see boost+git doc):
git clone https://github.com/boostorg/boost
cd boost
git submodule update --init
The Boost TypeTraits Library is located in libs/type_traits/
.
Running tests
First, make sure you are in libs/type_traits/test
.
You can either run all the tests listed in Jamfile.v2
or run a single test:
../../../b2 <- run all tests
../../../b2 config_info <- single test
Depends (2)
Reviews
Builds
toolchain |
public-0.17.0 |
target |
x86_64-microsoft-win32-msvc14.3 |
tgt config |
windows_10-msvc_17.10-O2 |
timestamp |
2025-08-24 02:12:16 UTC (02:56:12 hours ago) |
result |
success | log | rebuild |
toolchain |
public-0.17.0 |
target |
x86_64-microsoft-win32-msvc14.3 |
tgt config |
windows_10-msvc_17.10 |
timestamp |
2025-08-24 02:11:34 UTC (02:56:53 hours ago) |
result |
success | log | rebuild |
toolchain |
public-0.17.0 |
target |
x86_64-microsoft-win32-msvc14.3 |
tgt config |
windows_10-msvc_17.10-static_O2 |
timestamp |
2025-08-24 02:10:43 UTC (02:57:44 hours ago) |
result |
success | log | rebuild |
toolchain |
public-0.17.0 |
target |
x86_64-linux-gnu |
tgt config |
linux_debian_12-gcc_14-static_O3 |
timestamp |
2025-08-23 18:16:42 UTC (10:51:46 hours ago) |
result |
success | log | rebuild |
toolchain |
public-0.17.0 |
target |
x86_64-linux-gnu |
tgt config |
linux_debian_12-gcc_14-O3 |
timestamp |
2025-08-23 18:16:18 UTC (10:52:09 hours ago) |
result |
success | log | rebuild |
toolchain |
public-0.17.0 |
target |
x86_64-linux-gnu |
tgt config |
linux_debian_12-gcc_14-ndebug_O3 |
timestamp |
2025-08-23 18:15:31 UTC (10:52:56 hours ago) |
result |
success | log | rebuild |
toolchain |
public-0.17.0 |
target |
x86_64-linux-gnu |
tgt config |
linux_debian_12-gcc_14 |
timestamp |
2025-08-23 18:14:24 UTC (10:54:03 hours ago) |
result |
success | log | rebuild |
toolchain |
public-0.17.0 |
target |
aarch64-linux-gnu |
tgt config |
linux_debian_12-clang_18_libc++-static_O3 |
timestamp |
2025-08-23 07:56:47 UTC (21:11:40 hours ago) |
result |
success | log | rebuild |
toolchain |
public-0.17.0 |
target |
aarch64-linux-gnu |
tgt config |
linux_debian_12-clang_18_libc++-O3 |
timestamp |
2025-08-23 07:56:15 UTC (21:12:13 hours ago) |
result |
success | log | rebuild |
toolchain |
public-0.17.0 |
target |
aarch64-linux-gnu |
tgt config |
linux_debian_12-clang_18_libc++ |
timestamp |
2025-08-23 07:56:13 UTC (21:12:15 hours ago) |
result |
success | log | rebuild |
toolchain |
public-0.17.0 |
target |
aarch64-linux-gnu |
tgt config |
linux_debian_12-clang_18 |
timestamp |
2025-08-23 07:55:42 UTC (21:12:45 hours ago) |
result |
success | log | rebuild |
toolchain |
public-0.17.0 |
target |
aarch64-linux-gnu |
tgt config |
linux_debian_12-clang_18-static_O3 |
timestamp |
2025-08-23 07:55:41 UTC (21:12:47 hours ago) |
result |
success | log | rebuild |
toolchain |
public-0.17.0 |
target |
x86_64-linux-gnu |
tgt config |
linux_fedora_40-gcc_14-bindist |
timestamp |
2025-08-23 07:55:23 UTC (21:13:05 hours ago) |
result |
success | log | rebuild |
toolchain |
public-0.17.0 |
target |
aarch64-linux-gnu |
tgt config |
linux_debian_12-clang_18-O3 |
timestamp |
2025-08-23 07:54:35 UTC (21:13:53 hours ago) |
result |
success | log | rebuild |
toolchain |
public-0.17.0 |
target |
x86_64-microsoft-win32-msvc14.3 |
tgt config |
windows_10-clang_18_llvm_msvc_17.10-O2 |
timestamp |
2025-08-23 06:41:56 UTC (22:26:32 hours ago) |
result |
success | log | rebuild |
toolchain |
public-0.17.0 |
target |
x86_64-microsoft-win32-msvc14.3 |
tgt config |
windows_10-clang_18_llvm_msvc_17.10-static_O2 |
timestamp |
2025-08-23 06:39:58 UTC (22:28:30 hours ago) |
result |
success | log | rebuild |
toolchain |
public-0.17.0 |
target |
x86_64-microsoft-win32-msvc14.3 |
tgt config |
windows_10-clang_18_llvm_msvc_17.10 |
timestamp |
2025-08-23 06:36:21 UTC (22:32:07 hours ago) |
result |
success | log | rebuild |
toolchain |
public-0.17.0 |
target |
x86_64-linux-gnu |
tgt config |
linux_debian_12-gcc_12-bindist |
timestamp |
2025-08-23 06:15:45 UTC (22:52:42 hours ago) |
result |
success | log | rebuild |
toolchain |
public-0.17.0 |
target |
x86_64-w64-mingw32 |
tgt config |
windows_10-gcc_13.2_mingw_w64-static_O2 |
timestamp |
2025-08-23 06:15:30 UTC (22:52:58 hours ago) |
result |
success | log | rebuild |
toolchain |
public-0.17.0 |
target |
x86_64-microsoft-win32-msvc14.3 |
tgt config |
windows_10-msvc_17.8-static_O2 |
timestamp |
2025-08-23 06:15:19 UTC (22:53:08 hours ago) |
result |
success | log | rebuild |
toolchain |
public-0.17.0 |
target |
x86_64-microsoft-win32-msvc14.3 |
tgt config |
windows_10-msvc_17.8 |
timestamp |
2025-08-23 06:14:31 UTC (22:53:56 hours ago) |
result |
success | log | rebuild |
toolchain |
public-0.17.0 |
target |
x86_64-linux-gnu |
tgt config |
linux_ubuntu_24.04-gcc_13-bindist |
timestamp |
2025-08-23 06:14:29 UTC (22:53:58 hours ago) |
result |
success | log | rebuild |
toolchain |
public-0.17.0 |
target |
x86_64-microsoft-win32-msvc14.3 |
tgt config |
windows_10-msvc_17.8-O2 |
timestamp |
2025-08-23 06:13:27 UTC (22:55:01 hours ago) |
result |
success | log | rebuild |
toolchain |
public-0.17.0 |
target |
x86_64-w64-mingw32 |
tgt config |
windows_10-gcc_13.2_mingw_w64-O2 |
timestamp |
2025-08-23 06:12:37 UTC (22:55:51 hours ago) |
result |
success | log | rebuild |
toolchain |
public-0.17.0 |
target |
x86_64-w64-mingw32 |
tgt config |
windows_10-gcc_13.2_mingw_w64 |
timestamp |
2025-08-23 06:10:42 UTC (22:57:45 hours ago) |
result |
success | log | rebuild |
toolchain |
public-0.17.0 |
target |
x86_64-microsoft-win32-msvc14.3 |
tgt config |
windows_10-clang_17_msvc_msvc_17.10 |
timestamp |
2025-08-23 06:06:57 UTC (23:01:30 hours ago) |
result |
success | log | rebuild |
toolchain |
public-0.17.0 |
target |
x86_64-freebsd13.3 |
tgt config |
freebsd_13-clang_17 |
timestamp |
2025-08-23 05:54:48 UTC (23:13:40 hours ago) |
result |
success | log | rebuild |
toolchain |
public-0.17.0 |
target |
x86_64-freebsd14.1 |
tgt config |
freebsd_14-clang_18-static_O3 |
timestamp |
2025-08-23 05:54:01 UTC (23:14:27 hours ago) |
result |
success | log | rebuild |
toolchain |
public-0.17.0 |
target |
x86_64-freebsd14.1 |
tgt config |
freebsd_14-clang_18-O3 |
timestamp |
2025-08-23 05:50:11 UTC (23:18:16 hours ago) |
result |
success | log | rebuild |
toolchain |
public-0.17.0 |
target |
x86_64-freebsd14.1 |
tgt config |
freebsd_14-clang_18 |
timestamp |
2025-08-23 05:49:40 UTC (23:18:48 hours ago) |
result |
success | log | rebuild |
toolchain |
public-0.17.0 |
target |
x86_64-linux-gnu |
tgt config |
linux_debian_12-clang_17_libc++ |
timestamp |
2025-08-23 05:48:48 UTC (23:19:39 hours ago) |
result |
success | log | rebuild |
toolchain |
public-0.17.0 |
target |
x86_64-linux-gnu |
tgt config |
linux_debian_12-gcc_13.1 |
timestamp |
2025-08-23 05:47:47 UTC (23:20:40 hours ago) |
result |
success | log | rebuild |
toolchain |
public-0.17.0 |
target |
x86_64-linux-gnu |
tgt config |
linux_debian_12-clang_17 |
timestamp |
2025-08-23 05:46:36 UTC (23:21:51 hours ago) |
result |
success | log | rebuild |
toolchain |
public-0.17.0 |
target |
aarch64-linux-gnu |
tgt config |
linux_debian_12-gcc_14-ndebug_O3 |
timestamp |
2025-08-22 09:03:39 UTC (01 20:04:48 days ago) |
result |
success | log | rebuild |
toolchain |
public-0.17.0 |
target |
aarch64-linux-gnu |
tgt config |
linux_debian_12-gcc_14-static_O3 |
timestamp |
2025-08-22 09:02:35 UTC (01 20:05:53 days ago) |
result |
success | log | rebuild |
toolchain |
public-0.17.0 |
target |
aarch64-linux-gnu |
tgt config |
linux_debian_12-gcc_14 |
timestamp |
2025-08-22 09:02:03 UTC (01 20:06:25 days ago) |
result |
success | log | rebuild |
toolchain |
public-0.17.0 |
target |
aarch64-linux-gnu |
tgt config |
linux_debian_12-gcc_14-O3 |
timestamp |
2025-08-22 09:00:59 UTC (01 20:07:28 days ago) |
result |
success | log | rebuild |
toolchain |
public-0.17.0 |
target |
aarch64-linux-gnu |
tgt config |
linux_debian_12-clang_17 |
timestamp |
2025-08-22 03:29:48 UTC (02 01:38:40 days ago) |
result |
success | log | rebuild |
toolchain |
public-0.17.0 |
target |
aarch64-linux-gnu |
tgt config |
linux_debian_12-clang_17_libc++ |
timestamp |
2025-08-22 03:29:15 UTC (02 01:39:13 days ago) |
result |
success | log | rebuild |
toolchain |
public-0.17.0 |
target |
aarch64-linux-gnu |
tgt config |
linux_debian_12-gcc_13 |
timestamp |
2025-08-22 02:40:44 UTC (02 02:27:44 days ago) |
result |
success | log | rebuild |
toolchain |
public-0.17.0 |
target |
x86_64-linux-gnu |
tgt config |
linux_debian_12-clang_18 |
result |
unbuilt |
toolchain |
public-0.17.0 |
target |
x86_64-linux-gnu |
tgt config |
linux_debian_12-clang_18-O3 |
result |
unbuilt |
toolchain |
public-0.17.0 |
target |
x86_64-linux-gnu |
tgt config |
linux_debian_12-clang_18-static_O3 |
result |
unbuilt |
toolchain |
public-0.17.0 |
target |
x86_64-linux-gnu |
tgt config |
linux_debian_12-clang_18_libc++ |
result |
unbuilt |
toolchain |
public-0.17.0 |
target |
x86_64-linux-gnu |
tgt config |
linux_debian_12-clang_18_libc++-O3 |
result |
unbuilt |
toolchain |
public-0.17.0 |
target |
x86_64-linux-gnu |
tgt config |
linux_debian_12-clang_18_libc++-static_O3 |
result |
unbuilt |
toolchain |
public-0.17.0 |
target |
x86_64-linux-gnu |
tgt config |
linux_fedora_39-gcc_13-bindist |
result |
unbuilt |
toolchain |
public-0.17.0 |
target |
x86_64-apple-darwin22.5.0 |
tgt config |
macos_13-clang_15.0 |
result |
unbuilt |
toolchain |
public-0.17.0 |
target |
x86_64-apple-darwin23.5.0 |
tgt config |
macos_14-clang_15.0 |
result |
unbuilt |
toolchain |
public-0.17.0 |
target |
x86_64-apple-darwin23.5.0 |
tgt config |
macos_14-clang_15.0-O3 |
result |
unbuilt |
toolchain |
public-0.17.0 |
target |
x86_64-apple-darwin23.5.0 |
tgt config |
macos_14-clang_15.0-static_O3 |
result |
unbuilt |
target |
x86_64-apple-darwin23.5.0 |
tgt config |
macos_14-gcc_14_homebrew |
result |
excluded (https://github) |
target |
x86_64-apple-darwin23.5.0 |
tgt config |
macos_14-gcc_14_homebrew-O3 |
result |
excluded (https://github) |
target |
x86_64-apple-darwin23.5.0 |
tgt config |
macos_14-gcc_14_homebrew-static_O3 |
result |
excluded (https://github) |