Is there any writef() format specifier for a bool?

user_8925403 0
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I looked at the writef() documentation for any bool specifier and there didn't seem to be any.

In a Chapel program I have: ...

config const verify = false;
/* that works but I want to use writef() to also print a bunch of other stuff*/
writeln("verify = " + verify); 
writef("verify = %<what-specifier-goes-here>\n", verify);

This last statement works ok.

// I guess I could do:

writef( "verify = %s\n",if verify then "true" else "false");
chapel
2 Answers

Based on the FormattedIO documentation, there is not a bool specifier available in Chapel's formatted IO.

Instead, you can use the generic specifier (%t) to print bool types in formatted IO:

config const verify = false;
writef("verify = %t\n", verify);

This specifier utilizes the writeThis or readWriteThis method of the type to print the variable. The Chapel IO documentation provides more details on how these methods work.

user_67714230

No, there is no such <specifier> for bool in FormattedIO

As documentation explains, there is no such bool-value specific specifier in the recent Chapel language release.

A verify value-based conversion is fine.

config const verify    =  false;
var aTrueFalseAsSTRING = "false";

if verify then aTrueFalseAsSTRING = "true";

writef( "verify = %s\n",
         aTrueFalseAsSTRING
         );
user_36661970
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