Use this function to stop the program when control flow can only
reach the call if your API was improperly used.
In playgrounds and -Onone builds (the default for Xcode's Debug
configuration), stop program execution in a debuggable state
after printing message.
In -O builds (the default for Xcode's Release configuration),
stop program execution.
In -Ounchecked builds, the optimizer may assume that this
function will never be called. Failure to satisfy that assumption
is a serious programming error.
Indicate that a precondition was violated.
Use this function to stop the program when control flow can only reach the call if your API was improperly used.
In playgrounds and -Onone builds (the default for Xcode's Debug configuration), stop program execution in a debuggable state after printing
message.In -O builds (the default for Xcode's Release configuration), stop program execution.
In -Ounchecked builds, the optimizer may assume that this function will never be called. Failure to satisfy that assumption is a serious programming error.
Declaration
@noreturnfuncpreconditionFailure(@autoclosuremessage: () ->String=default,file:StaticString=default,line:UInt=default)