Re: How to invert bool false/true in alias compose?

[Timon Gehr via Digitalmars-d-learn]

On 07.12.19 05:00, Marcone wrote:

import std;

alias cmd = compose!(to!bool, wait, spawnShell, to!string);

void main(){
     writeln(cmd("where notepad.exe"));
}


Result:

C:\Windows\System32\notepad.exe
C:\Windows\notepad.exe
false

The result show "false" because good spawnshell command return 0 and 0 to bool is false. But I want to invert false to true to get true or false if command success.

alias cmd = compose!(not!(to!bool), wait, spawnShell, to!string);