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50 lines
1.4 KiB
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50 lines
1.4 KiB
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=======================
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Extended C++03 Support
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=======================
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.. contents::
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:local:
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Overview
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========
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libc++ is an implementation of the C++ standard library targeting C++11 or later.
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In C++03, the library implements the C++11 standard using C++11 language extensions provided
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by Clang.
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This document tracks the C++11 extensions libc++ requires, the C++11 extensions it provides,
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and how to write minimal C++11 inside libc++.
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Required C++11 Compiler Extensions
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==================================
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Clang provides a large subset of C++11 in C++03 as an extension. The features
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libc++ expects Clang to provide are:
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* Variadic templates.
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* RValue references and perfect forwarding.
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* Alias templates
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* defaulted and deleted Functions.
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* reference qualified Functions
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* ``auto``
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There are also features that Clang *does not* provide as an extension in C++03
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mode. These include:
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* ``constexpr`` and ``noexcept``
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* Trailing return types.
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* ``>>`` without a space.
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Provided C++11 Library Extensions
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=================================
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.. warning::
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The C++11 extensions libc++ provides in C++03 are currently undergoing change. Existing extensions
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may be removed in the future. New users are strongly discouraged depending on these extension
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in new code.
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This section will be updated once the libc++ developer community has further discussed the
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future of C++03 with libc++.
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