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Code Issues Releases Wiki Activity

ircd: Various additional commentary.

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This commit is contained in:
Jason Volk 2017-03-20 18:04:57 -07:00
parent 99eacb0932
commit fdfefff72e
1 changed files with 20 additions and 0 deletions
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20
include/ircd/util.h
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@ -495,6 +495,13 @@ at(It &&start,
} }
//
// Customized std::string_view (experimental TS / C++17)
//
// This class adds iterator-based (char*, char*) construction to std::string_view which otherwise
// takes traditional (char*, size_t) arguments. This allows boost::spirit grammars to create
// string_view's using the raw[] directive achieving zero-copy/zero-allocation parsing.
//
struct string_view struct string_view
:std::string_view :std::string_view
{ {
@ -531,6 +538,10 @@ struct string_view
}; };
//
// Error-checking closure for POSIX system calls. Note the usage is
// syscall(read, foo, bar, baz) not a macro like syscall(read(foo, bar, baz));
//
template<class function, template<class function,
class... args> class... args>
auto auto
@ -545,6 +556,15 @@ syscall(function&& f,
} }
//
// Similar to a va_list, but conveying std-c++ type data acquired from a variadic template
// parameter pack acting as the ...) elipsis. This is used to implement fmt::snprintf(),
// exceptions and logger et al in their respective translation units rather than the header
// files.
//
// Limitations: The choice of a fixed array of 8 is because std::initializer_list doesn't
// seem to work and other containers may be heavy in this context.
//
struct va_rtti struct va_rtti
:std::array<std::pair<const void *, const std::type_info *>, 8> :std::array<std::pair<const void *, const std::type_info *>, 8>
{ {