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function: catch earlier programming error (#8)

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Place at first line of the function body a function type safe guard
check.
This commit is contained in:
donutloop
2021-12-30 13:22:00 +01:00
committed by GitHub
parent 0b0eb695e8
commit 613785b07c
2 changed files with 25 additions and 5 deletions
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16
function/function_util.go
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@@ -14,6 +14,15 @@ func invokeFunc(fn interface{}, args ...interface{}) []reflect.Value {
return fv.Call(params)
}
func unsafeInvokeFunc(fn interface{}, args ...interface{}) []reflect.Value {
fv := reflect.ValueOf(fn)
params := make([]reflect.Value, len(args))
for i, item := range args {
params[i] = reflect.ValueOf(item)
}
return fv.Call(params)
}
func functionValue(function interface{}) reflect.Value {
v := reflect.ValueOf(function)
if v.Kind() != reflect.Func {
@@ -21,3 +30,10 @@ func functionValue(function interface{}) reflect.Value {
}
return v
}
func MustBeFunction(function interface{}) {
v := reflect.ValueOf(function)
if v.Kind() != reflect.Func {
panic(fmt.Sprintf("Invalid function type, value of type %T", function))
}
}