[cfe-dev] [libcxx] Which headers must include other headers?
Craig, Ben via cfe-dev
cfe-dev at lists.llvm.org
Wed Mar 9 14:20:20 PST 2016
From the C++14 spec...
220.127.116.11 Headers [res.on.headers]
1 A C++ header may include other C++ headers. A C++ header shall
provide the declarations and definitions
that appear in its synopsis. A C++ header shown in its synopsis as
including other C++ headers shall provide
the declarations and definitions that appear in the synopses of
those other headers.
I'm not 100% sure I know what this means. If a header (say...
<system_error>) mentions a class (like std::string), is it required to
provide the full definition for std::string, or is the forward declared
template good enough? Right now, libcxx uses the forward declaration.
What about entities that have specializations scattered all over the
place, like std::hash? Is the unspecialized forward declaration good
enough, or does the full bulk of all the std::hash specializations have
to come along too?
Employee of Qualcomm Innovation Center, Inc.
Qualcomm Innovation Center, Inc. is a member of Code Aurora Forum, a Linux Foundation Collaborative Project
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