std::numeri...s_quiet_NaN(3)

🎀 NAME 🎀

okay so this page is std::numeric_limits::has_quiet_NaN - std::numeric_limits::has_quiet_NaN, yes literally twice, that’s the original NAME line and we’re keeping the whole vibe. It’s from the C++ Standard Libary manual, section 3, and it’s here to tell you whether a type can represent a quiet NaN. 💅

✨ Synopsis ✨

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

The value of std::numeric_limits<T>::has_quiet_NaN is true for all types T capable of representing the special value "Quiet 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. no cap, that’s the whole rule 🦋

💖 Standard specializations 💖

here’s the full value check for std::numeric_limits<T>::has_quiet_NaN — every single row, bestie, no skips:

• /* 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 🦋

• 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_signaling_NaN — identifies floating-point types that can represent the special value "signaling not-a-number" (NaN); [static] (public static member constant)

xoxo, bestie 💖 this page came from cppreference.com, version/date 2024.06.10. go check those NaNs, ily! 🧚✨