type ipMaskValue … func newIPMaskValue(val net.IPMask, p *net.IPMask) *ipMaskValue { … } func (i *ipMaskValue) String() string { … } func (i *ipMaskValue) Set(s string) error { … } func (i *ipMaskValue) Type() string { … } // ParseIPv4Mask written in IP form (e.g. 255.255.255.0). // This function should really belong to the net package. func ParseIPv4Mask(s string) net.IPMask { … } func parseIPv4Mask(sval string) (interface{ … } // GetIPv4Mask return the net.IPv4Mask value of a flag with the given name func (f *FlagSet) GetIPv4Mask(name string) (net.IPMask, error) { … } // IPMaskVar defines an net.IPMask flag with specified name, default value, and usage string. // The argument p points to an net.IPMask variable in which to store the value of the flag. func (f *FlagSet) IPMaskVar(p *net.IPMask, name string, value net.IPMask, usage string) { … } // IPMaskVarP is like IPMaskVar, but accepts a shorthand letter that can be used after a single dash. func (f *FlagSet) IPMaskVarP(p *net.IPMask, name, shorthand string, value net.IPMask, usage string) { … } // IPMaskVar defines an net.IPMask flag with specified name, default value, and usage string. // The argument p points to an net.IPMask variable in which to store the value of the flag. func IPMaskVar(p *net.IPMask, name string, value net.IPMask, usage string) { … } // IPMaskVarP is like IPMaskVar, but accepts a shorthand letter that can be used after a single dash. func IPMaskVarP(p *net.IPMask, name, shorthand string, value net.IPMask, usage string) { … } // IPMask defines an net.IPMask flag with specified name, default value, and usage string. // The return value is the address of an net.IPMask variable that stores the value of the flag. func (f *FlagSet) IPMask(name string, value net.IPMask, usage string) *net.IPMask { … } // IPMaskP is like IPMask, but accepts a shorthand letter that can be used after a single dash. func (f *FlagSet) IPMaskP(name, shorthand string, value net.IPMask, usage string) *net.IPMask { … } // IPMask defines an net.IPMask flag with specified name, default value, and usage string. // The return value is the address of an net.IPMask variable that stores the value of the flag. func IPMask(name string, value net.IPMask, usage string) *net.IPMask { … } // IPMaskP is like IP, but accepts a shorthand letter that can be used after a single dash. func IPMaskP(name, shorthand string, value net.IPMask, usage string) *net.IPMask { … }