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Implement fmt::ensure (assert-like with formatted message) + fmt::tie

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Arguments should be provided via fmt::tie() due to some limitations.
Allow to specify simple message (non-formatting) for plain ::ensure().
Remove redundant function for narrow error.
This commit is contained in:
Nekotekina 2021-06-09 19:05:25 +03:00
parent 766cc2d42f
commit 696be6aacd
4 changed files with 76 additions and 17 deletions
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62
Utilities/StrFmt.h
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@ -293,4 +293,66 @@ namespace fmt
template <typename CharT, usz N, typename... Args>
throw_exception(const CharT(&)[N], const Args&...) -> throw_exception<CharT, N, Args...>;
// Helper template: pack format variables
template <typename Arg = void, typename... Args>
struct tie
{
// Universal reference
std::add_rvalue_reference_t<Arg> arg;
tie<Args...> next;
// Store only references, unveil op is postponed
tie(Arg&& arg, Args&&... args) noexcept
: arg(std::forward<Arg>(arg))
, next(std::forward<Args>(args)...)
{
}
using type = std::remove_cvref_t<Arg>;
// Storage for fmt_unveil (deferred initialization)
decltype(fmt_unveil<type>::get(std::declval<Arg>())) value;
void init(u64 to[])
{
value = fmt_unveil<type>::get(arg);
to[0] = value;
next.init(to + 1);
}
};
template <>
struct tie<void>
{
void init(u64 to[]) const
{
// Isn't really null terminated, this value has no meaning
to[0] = 0;
}
};
template <typename... Args>
tie(Args&&... args) -> tie<Args...>;
// Ensure with formatting
template <typename T, typename CharT, usz N, typename... Args>
decltype(auto) ensure(T&& arg, const CharT(&fmt)[N], tie<Args...> args,
u32 line = __builtin_LINE(),
u32 col = __builtin_COLUMN(),
const char* file = __builtin_FILE(),
const char* func = __builtin_FUNCTION()) noexcept
{
if (std::forward<T>(arg)) [[likely]]
{
return std::forward<T>(arg);
}
// Prepare u64 array
u64 data[sizeof...(Args) + 1];
args.init(data);
raw_throw_exception({line, col, file, func}, reinterpret_cast<const char*>(fmt), type_info_v<std::remove_cvref_t<Args>...>, +data);
}
}