• Simon (19/19) Jan 30 2020 Hi dlang community,
• MoonlightSentinel (4/23) Jan 30 2020 You can use m_string2edge.clear() if you want to remove all
• Simon (7/38) Feb 03 2020 Hi MoonlightSentinel,
• Adam D. Ruppe (2/3) Jan 30 2020 null is the initial state for those.
• Minty Fresh (5/8) Jan 31 2020 More generally, .init can be used as to get the initial state for
• Simon (2/12) Feb 03 2020 Thank you, Minty Fresh, this was the solution!

Simon <lehmayr+d gmail.com> writes:

Hi dlang community,

I'm trying to implement a "reset" functionality which should 
revert all variables to the program start initial state.

Example:

import Graph;
protected Edge[string] m_string2edge;

int main()
{
     // adding some elements
     // not important how it works
     // m_string2edge[name] = e;

     // resetting it
     m_string2edge = null;
     m_string2edge = new Edge[string]; // <- won't compile

     return 0;
}

How do I revert my variable to the init state?

Thanks in advance,
Simon

MoonlightSentinel <moonlightsentinel disroot.org> writes:

On Thursday, 30 January 2020 at 21:09:41 UTC, Simon wrote:
 Hi dlang community,

 I'm trying to implement a "reset" functionality which should 
 revert all variables to the program start initial state.

 Example:

 import Graph;
 protected Edge[string] m_string2edge;

 int main()
 {
     // adding some elements
     // not important how it works
     // m_string2edge[name] = e;

     // resetting it
     m_string2edge = null;
     m_string2edge = new Edge[string]; // <- won't compile

     return 0;
 }

 How do I revert my variable to the init state?

 Thanks in advance,
 Simon

You can use m_string2edge.clear() if you want to remove all 
entries from m_string2edge.

See https://dlang.org/spec/hash-map.html#properties

Simon <lehmayr+d gmail.com> writes:

On Thursday, 30 January 2020 at 21:18:04 UTC, MoonlightSentinel 
wrote:
 On Thursday, 30 January 2020 at 21:09:41 UTC, Simon wrote:
 Hi dlang community,

 I'm trying to implement a "reset" functionality which should 
 revert all variables to the program start initial state.

 Example:

 import Graph;
 protected Edge[string] m_string2edge;

 int main()
 {
     // adding some elements
     // not important how it works
     // m_string2edge[name] = e;

     // resetting it
     m_string2edge = null;
     m_string2edge = new Edge[string]; // <- won't compile

     return 0;
 }

 How do I revert my variable to the init state?

 Thanks in advance,
 Simon

 You can use m_string2edge.clear() if you want to remove all 
 entries from m_string2edge.

 See https://dlang.org/spec/hash-map.html#properties

Hi MoonlightSentinel,

in this case it won't compile:
..\Electrics.d(42): Error: function Electrics.clear() is not 
callable using argument types (Edge[string])
..\Electrics.d(42):        expected 0 argument(s), not 1

Adam D. Ruppe <destructionator gmail.com> writes:

On Thursday, 30 January 2020 at 21:09:41 UTC, Simon wrote:
 How do I revert my variable to the init state?

null is the initial state for those.

Minty Fresh <mintiewute+dlang gmail.com> writes:

On Thursday, 30 January 2020 at 21:36:53 UTC, Adam D. Ruppe wrote:
 On Thursday, 30 January 2020 at 21:09:41 UTC, Simon wrote:
 How do I revert my variable to the init state?

 null is the initial state for those.

More generally, .init can be used as to get the initial state for 
any type.

ie.
   m_string2edge = typeof(m_string2edge).init;

Simon <lehmayr+d gmail.com> writes:

On Friday, 31 January 2020 at 14:01:04 UTC, Minty Fresh wrote:
 On Thursday, 30 January 2020 at 21:36:53 UTC, Adam D. Ruppe 
 wrote:
 On Thursday, 30 January 2020 at 21:09:41 UTC, Simon wrote:
 How do I revert my variable to the init state?

 null is the initial state for those.

 More generally, .init can be used as to get the initial state 
 for any type.

 ie.
   m_string2edge = typeof(m_string2edge).init;

Thank you, Minty Fresh, this was the solution!