Movement against float.init being nan

[Ali Çehreli]

On 8/23/22 01:07, IGotD- wrote:
 > On Tuesday, 23 August 2022 at 01:19:35 UTC, Steven Schveighoffer wrote:
 >>
 >> Agreed that C/C++ initializing with garbage is the worst option.
 >>
 >> C# (as also mentioned) uses 0.
 >>
 >> I'm curious what all languages do that actually use an initial value?
 >>
 >> -Steve
 >
 > C++11 default value initialization exist. Meaning this
 >
 > ```c++
 > double x{};
 > ```

At that level, it's the same in D:

// Garbage value:
   double x = void;   // D
   double x;          // C++

// Zero value:
   double x = 0;      // D
   double x{};        // C++

However, there is a difference with members:

struct S {
   double x;
}  // Add ; here for C++

   S();   // S.x is double.nan in D
   S{};   // S.x is 0 in C++

 > find a language other than D that default initializes
 > floats to NaN.

I failed with a quick search.

However, I still think initial value being nan is not an issue even if 
it does not meet programmer expectations. For example, D could not leave 
the value as garbage as C++ programmers comfortably expect so. And I am 
pretty sure the default value cannot be changed for D at this time.

Ali