Re: New feature proposal: "initialization scope"

[deadalnix]

On Thursday, 16 May 2013 at 07:53:08 UTC, TommiT wrote:
I'd like to make it easier to initialize function local 
immutable/const data. Here's the type of problem I'd like to 
alleviate:

const string[100] int__str;
const int[string] str__int;

for (int i = 0; i < 100; ++i)
{
    auto str = to!string(i);
    int__str[i] = str; // ERROR: Can't modify const
    str__int[str] = i; // ERROR: Can't modify const
}

In short, I want to initialize two different const variables at 
once (in the same loop or other block). If I needed to 
initialize only one const variable, I could use a lambda:

const string[100] int__str = {
    string[100] tmp;
    // ... init tmp ...
    return tmp;
}();


This is easy to work around that using a mutable data, construct 
it and then copy it to a const one.

You my argue that this is slower, and I answer you : maybe. Can 
you show what does GDC or LDC output doing so ?