20 August 2020

Warning: std::numeric_limits::min() > 0

Tyler Young
Tyler Young @TylerAYoung

Here’s a baffling design choice (which I’m reliably informed C++ inherited from older C limits.h).

std::numeric_limits<int>::min() is roughly -2 billion (assuming 32 bit ints, etc.).

But std::numeric_limits<float>::min() is smallest positive floating point value… something like +0.00000000000000000000000000000000000001.

CppReference warns this is the case for all floating point types with denormalization (thus it applies to double and long double as well on vaguely x86-like platforms).

What you’re probably looking for (the actual opposite of std::numeric_limits<float>::max()) is std::numeric_limits::lowest().

Categories

Programming Cpp