std::numeri...min_exponent(3)

💖 NAME 💖

std::numeric_limits::min_exponent — std::numeric_limits::min_exponent

hiii bestie, welcome to the std::numeri...min_exponent(3) page from the C++ Standard Libary manual. Yes, the name section is literally the same thing twice — iconic symmetry, no notes 💅.

🌸 Synopsis 🌸

static const int min_exponent;      (until C++11)
static constexpr int min_exponent;  (since C++11)

okay so the tea is: the value of std::numeric_limits<T>::min_exponent is the lowest negative number n such that r^(n-1) — yep, r to the n-1, also shown as rn-1 in the flattened text — where r is std::numeric_limits<T>::radix, is a valid normalized value of the floating-point type T. That's the whole vibe ✨.

👑 Standard specializations 👑

here's the whole squad, bestie — for each T, this is the value of std::numeric_limits<T>::min_exponent:

• /* non-specialized */ — 0
• bool — 0
• char — 0
• signed char — 0
• unsigned char — 0
• wchar_t — 0
• char8_t (since C++20) — 0
• char16_t (since C++11) — 0
• char32_t (since C++11) — 0
• short — 0
• unsigned short — 0
• int — 0
• unsigned int — 0
• long — 0
• unsigned long — 0
• long long (since C++11) — 0
• unsigned long long (since C++11) — 0
• float — FLT_MIN_EXP
• double — DBL_MIN_EXP
• long double — LDBL_MIN_EXP

🦋 Example 🦋

This example demonstrates the relationships of min_exponent, min_exponent10, min(), and radix for the type float:

// Run this code

#include <iostream>
#include <limits>

int main()
{
    std::cout << "min() = " << std::numeric_limits<float>::min() << '\n'
              << "min_exponent10 = " << std::numeric_limits<float>::min_exponent10 << '\n'
              << std::hexfloat << '\n'
              << "min() = " << std::numeric_limits<float>::min() << '\n'
              << "min_exponent = " << std::numeric_limits<float>::min_exponent << '\n';
}

🍓 Output 🍓

min() = 1.17549e-38
min_exponent10 = -37

min() = 0x1p-126
min_exponent = -125

🌈 See also 🌈

• radix — the radix or integer base used by the representation of the given type. [static] (public static member constant).
• min_exponent10 — the smallest negative power of ten that is a valid normalized floating-point value. [static] (public static member constant).
• max_exponent — one more than the largest integer power of the radix that is a valid finite floating-point value. [static] (public static member constant).
• max_exponent10 — the largest integer power of 10 that is a valid finite floating-point value. [static] (public static member constant).

💌 source: http://cppreference.com · version/date: 2024.06.10 — mwah 💋 go slay those normalized floats, bestie 💅