Commit caabb6e1 authored by Brad King's avatar Brad King 💬
Browse files

Help/dev: Adopt C++ subset rules in coding guide

Move the C++ subset rules from the `cmake-developer(7)` into our
dedicated coding guide since they do not need to be in user-facing
documentation.
parent 0fd255ad
......@@ -19,3 +19,24 @@ format only a subset of files, such as those that are locally modified.
.. _`clang-format`: http://clang.llvm.org/docs/ClangFormat.html
.. _`.clang-format`: ../../.clang-format
.. _`Utilities/Scripts/clang-format.bash`: ../../Utilities/Scripts/clang-format.bash
C++ Subset Permitted
====================
CMake supports compiling as C++98 in addition to C++11 and C++14.
In order to support building on older toolchains some constructs
need to be handled with care:
* Use ``CM_AUTO_PTR`` instead of ``std::auto_ptr``.
The ``std::auto_ptr`` template is deprecated in C++11. We want to use it
so we can build on C++98 compilers but we do not want to turn off compiler
warnings about deprecated interfaces in general. Use the ``CM_AUTO_PTR``
macro instead.
* Use ``size_t`` instead of ``std::size_t``.
Various implementations have differing implementation of ``size_t``.
When assigning the result of ``.size()`` on a container for example,
the result should be assigned to ``size_t`` not to ``std::size_t``,
``unsigned int`` or similar types.
......@@ -13,30 +13,6 @@ Introduction
This manual is intended for reference by developers modifying the CMake
source tree itself, and by those authoring externally-maintained modules.
Permitted C++ Subset
====================
CMake is required to build with ancient C++ compilers and standard library
implementations. Some common C++ constructs may not be used in CMake in order
to build with such toolchains.
std::auto_ptr
-------------
The ``std::auto_ptr`` template is deprecated in C++11. We want to use it
so we can build on C++98 compilers but we do not want to turn off compiler
warnings about deprecated interfaces in general. Use the ``CM_AUTO_PTR``
macro instead.
size_t
------
Various implementations have differing implementation of ``size_t``. When
assigning the result of ``.size()`` on a container for example, the result
should be assigned to ``size_t`` not to ``std::size_t``, ``unsigned int`` or
similar types.
Adding Compile Features
=======================
......
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