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 |
aarch64-linux-gnu |
tgt config |
linux_debian_12-clang_17 |
timestamp |
2025-09-24 15:34:21 UTC (06:02:29 hours ago) |
result |
success | log | rebuild |
toolchain |
public-0.17.0 |
target |
aarch64-linux-gnu |
tgt config |
linux_debian_12-clang_17_libc++ |
timestamp |
2025-09-24 15:33:43 UTC (06:03:07 hours ago) |
result |
success | log | rebuild |
toolchain |
public-0.17.0 |
target |
aarch64-linux-gnu |
tgt config |
linux_debian_12-gcc_13 |
timestamp |
2025-09-24 13:55:55 UTC (07:40:55 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 |
2025-09-23 23:34:00 UTC (22:02:51 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 |
2025-09-23 23:33:38 UTC (22:03:12 hours ago) |
result |
success | log | rebuild |
toolchain |
public-0.17.0 |
target |
aarch64-linux-gnu |
tgt config |
linux_debian_12-clang_18_libc++ |
timestamp |
2025-09-23 23:27:40 UTC (22:09:10 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 |
2025-09-23 23:26:58 UTC (22:09:52 hours ago) |
result |
success | log | rebuild |
toolchain |
public-0.17.0 |
target |
aarch64-linux-gnu |
tgt config |
linux_debian_12-clang_18 |
timestamp |
2025-09-23 23:25:40 UTC (22:11:11 hours ago) |
result |
success | log | rebuild |
toolchain |
public-0.17.0 |
target |
aarch64-linux-gnu |
tgt config |
linux_debian_12-clang_18-O3 |
timestamp |
2025-09-23 23:24:18 UTC (22:12:32 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 |
2025-09-22 22:49:58 UTC (01 22:46:52 days 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 |
2025-09-22 19:28:18 UTC (02 02:08:32 days 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 |
2025-09-22 19:27:50 UTC (02 02:09:00 days 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 |
2025-09-22 19:27:24 UTC (02 02:09:27 days 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 |
2025-09-22 19:27:07 UTC (02 02:09:44 days 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 |
2025-09-22 19:26:48 UTC (02 02:10:03 days 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 |
2025-09-22 19:26:21 UTC (02 02:10:29 days ago) |
result |
success | log | rebuild |
toolchain |
public-0.17.0 |
target |
x86_64-microsoft-win32-msvc14.3 |
tgt config |
windows_10-msvc_17.10-O2 |
timestamp |
2025-09-22 19:23:46 UTC (02 02:13:05 days ago) |
result |
success | log | rebuild |
toolchain |
public-0.17.0 |
target |
x86_64-linux-gnu |
tgt config |
linux_debian_12-gcc_12-bindist |
timestamp |
2025-09-22 19:23:22 UTC (02 02:13:28 days 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 |
2025-09-22 19:22:59 UTC (02 02:13:51 days 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 |
2025-09-22 19:22:41 UTC (02 02:14:09 days 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 |
2025-09-22 19:21:47 UTC (02 02:15:03 days 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 |
2025-09-22 19:21:31 UTC (02 02:15:20 days 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 |
2025-09-22 19:20:46 UTC (02 02:16:04 days 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 |
2025-09-22 19:20:15 UTC (02 02:16:36 days 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 |
2025-09-22 19:17:45 UTC (02 02:19:06 days 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 |
2025-09-22 19:17:42 UTC (02 02:19:09 days ago) |
result |
success | log | rebuild |
toolchain |
public-0.17.0 |
target |
x86_64-linux-gnu |
tgt config |
linux_debian_12-gcc_14-O3 |
timestamp |
2025-09-22 19:17:21 UTC (02 02:19:29 days ago) |
result |
success | log | rebuild |
toolchain |
public-0.17.0 |
target |
x86_64-linux-gnu |
tgt config |
linux_debian_12-gcc_14 |
timestamp |
2025-09-22 19:17:10 UTC (02 02:19:41 days 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 |
2025-09-22 19:16:50 UTC (02 02:20:01 days ago) |
result |
success | log | rebuild |
toolchain |
public-0.17.0 |
target |
x86_64-freebsd13.3 |
tgt config |
freebsd_13-clang_17 |
timestamp |
2025-09-22 19:10:58 UTC (02 02:25:52 days ago) |
result |
success | log | rebuild |
toolchain |
public-0.17.0 |
target |
x86_64-freebsd14.1 |
tgt config |
freebsd_14-clang_18-static_O3 |
timestamp |
2025-09-22 19:05:56 UTC (02 02:30:54 days ago) |
result |
success | log | rebuild |
toolchain |
public-0.17.0 |
target |
x86_64-freebsd14.1 |
tgt config |
freebsd_14-clang_18 |
timestamp |
2025-09-22 19:05:14 UTC (02 02:31:36 days ago) |
result |
success | log | rebuild |
toolchain |
public-0.17.0 |
target |
x86_64-linux-gnu |
tgt config |
linux_debian_12-gcc_13.1 |
timestamp |
2025-09-22 19:04:57 UTC (02 02:31:53 days ago) |
result |
success | log | rebuild |
toolchain |
public-0.17.0 |
target |
x86_64-freebsd14.1 |
tgt config |
freebsd_14-clang_18-O3 |
timestamp |
2025-09-22 19:04:50 UTC (02 02:32:01 days ago) |
result |
success | log | rebuild |
toolchain |
public-0.17.0 |
target |
x86_64-linux-gnu |
tgt config |
linux_debian_12-clang_17 |
timestamp |
2025-09-22 19:04:00 UTC (02 02:32:50 days ago) |
result |
success | log | rebuild |
toolchain |
public-0.17.0 |
target |
x86_64-linux-gnu |
tgt config |
linux_debian_12-clang_17_libc++ |
timestamp |
2025-09-22 19:03:50 UTC (02 02:33:00 days ago) |
result |
success | log | rebuild |
toolchain |
public-0.17.0 |
target |
aarch64-linux-gnu |
tgt config |
linux_debian_12-gcc_14-O3 |
timestamp |
2025-09-20 19:18:24 UTC (04 02:18:27 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 |
2025-09-20 19:14:11 UTC (04 02:22:40 days ago) |
result |
success | log | rebuild |
toolchain |
public-0.17.0 |
target |
aarch64-linux-gnu |
tgt config |
linux_debian_12-gcc_14-ndebug_O3 |
timestamp |
2025-09-20 19:13:37 UTC (04 02:23:13 days ago) |
result |
success | log | rebuild |
toolchain |
public-0.17.0 |
target |
aarch64-linux-gnu |
tgt config |
linux_debian_12-gcc_14 |
timestamp |
2025-09-20 19:10:57 UTC (04 02:25:54 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) |