std::numeri...gnaling_NaN(3)

okay so bestie, welcome to the std::numeri...gnaling_NaN(3) page from the C++ Standard Libary — we're here to talk about std::numeric_limits::has_signaling_NaN, and yes the title is giving dramatic ellipsis energy 💅

🌸 NAME 🌸

std::numeric_limits::has_signaling_NaN — std::numeric_limits::has_signaling_NaN (she said it twice, and honestly? periodt.)

✨ Synopsis ✨

okay so here's the exact signature situation, no cap:

static const bool has_signaling_NaN;      (until C++11)
static constexpr bool has_signaling_NaN;  (since C++11)

The value of std::numeric_limits<T>::has_signaling_NaN is true for all types T capable of representing the special value "Signaling Not-A-Number". This constant is meaningful for all floating-point types and is guaranteed to be true if std::numeric_limits<T>::is_iec559 == true.

🎀 Standard specializations 🎀

Vibe check for every T — the value of std::numeric_limits<T>::has_signaling_NaN is:

• /* non-specialized */ — false
• bool — false
• char — false
• signed char — false
• unsigned char — false
• wchar_t — false
• char8_t (since C++20) — false
• char16_t (since C++11) — false
• char32_t (since C++11) — false
• short — false
• unsigned short — false
• int — false
• unsigned int — false
• long — false
• unsigned long — false
• long long (since C++11) — false
• unsigned long long (since C++11) — false
• float — usually true
• double — usually true
• long double — usually true

🌈 See also 🌈

Other little icons in the same orbit 🫶:

• quiet_NaN — returns a quiet NaN value of the given floating-point type; [static] (public static member function)
• has_infinity — identifies floating-point types that can represent the special value "positive infinity"; [static] (public static member constant)
• has_quiet_NaN — identifies floating-point types that can represent the special value "quiet not-a-number" (NaN); [static] (public static member constant)

and that's the page! source: http://cppreference.com · version/date: 2024.06.10 — bye bestie, go stan signaling NaNs responsibly 💖✨