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ircd::util: Minor clarifications to va_rtti.

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This commit is contained in:
Jason Volk 2017-08-16 11:06:24 -06:00
parent 77a6bc2d51
commit 7a9f765faa
1 changed files with 23 additions and 8 deletions
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31
include/ircd/util.h
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@ -979,22 +979,30 @@ syscall(function&& f,
// exceptions and logger et al in their respective translation units rather than the header // exceptions and logger et al in their respective translation units rather than the header
// files. // files.
// //
// Limitations: The choice of a fixed array of 12 is because std::initializer_list doesn't // Limitations: The choice of a fixed array of N is because std::initializer_list doesn't
// seem to work and other containers may be heavy in this context. // work here and other containers may be heavy in this context. Ideas to improve this are
// welcome.
// //
const size_t VA_RTTI_MAX_SIZE = 12;
struct va_rtti struct va_rtti
:std::array<std::pair<const void *, const std::type_info *>, 12> :std::array<std::pair<const void *, const std::type_info *>, VA_RTTI_MAX_SIZE>
{ {
size_t argc; using base_type = std::array<value_type, VA_RTTI_MAX_SIZE>;
size_t size() const static constexpr size_t max_size()
{
return std::tuple_size<base_type>();
}
size_t argc;
const size_t &size() const
{ {
return argc; return argc;
} }
template<class... Args> template<class... Args>
va_rtti(Args&&... args) va_rtti(Args&&... args)
:std::array<std::pair<const void *, const std::type_info *>, 12> :base_type
{{ {{
std::make_pair(std::addressof(args), std::addressof(typeid(Args)))... std::make_pair(std::addressof(args), std::addressof(typeid(Args)))...
}} }}
@ -1003,11 +1011,18 @@ struct va_rtti
sizeof...(args) sizeof...(args)
} }
{ {
assert(argc <= 8); assert(argc <= max_size());
} }
}; };
static_assert(sizeof(va_rtti) == 192 + 8, ""); static_assert
(
sizeof(va_rtti) == (va_rtti::max_size() * 16) + 8,
"va_rtti should be (8 + 8) * N + 8;"
" where 8 + 8 are the two pointers carrying the argument and its type data;"
" where N is the max arguments;"
" where the final + 8 bytes holds the actual number of arguments passed;"
);
// //