std::numeri...has_infinity(3)

🌸 NAME 🌸

okay so this is the std::numeri...has_infinity(3) page — from the C++ Standard Libary manual, section 3, bestie 💖 and we are talking about std::numeric_limits::has_infinity, no cap.

std::numeric_limits::has_infinity — std::numeric_limits::has_infinity

🦋 Synopsis 🦋

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

The value of std::numeric_limits<T>::has_infinity is true for all types T capable of representing the positive infinity as a distinct special value. 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 🦋

here’s the T → value of std::numeric_limits<T>::has_infinity vibe check, bestie 👇

• /* 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

🎀 Example 🎀

// Run this code

#include <iostream>
#include <limits>

int main()
{
    std::cout << std::boolalpha
              << std::numeric_limits<int>::has_infinity << '\n'
              << std::numeric_limits<long>::has_infinity << '\n'
              << std::numeric_limits<float>::has_infinity << '\n'
              << std::numeric_limits<double>::has_infinity << '\n';
}

🍓 Possible output 🍓

false
false
true
true

🌈 See also 🌈

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

mwah 💋 this cutie came from http://cppreference.com, dated 2024.06.10 — and the page is std::numeri...has_infinity(3) — bye bestie 🫶✨