version.cpp

bool operator<(const Version& other) {
	if (major < other.major)
		return true;
	if (minor < other.minor)
		return true;
	if (revision < other.revision)
		return true;
	if (build < other.build)
		return true;
	return false;
}

wersion.cpp

bool operator<(const Version& other) {
	if (major != other.major) 
		return (major < other.major);
	if (minor != other.minor) 
 		return (minor < other.minor);
	if (revision != other.revision) 
		return (revision < other.revision);
	if (build != other.build)
		return (build < other.build);
	return false;
}

xersion.cpp

#define o(x) \
  if (x != other.x) return (x < other.x)

bool operator<(const Version& other) {
	o(major);
	o(minor);
	o(revision);
	o(build);
	return false;
}

yersion.rs

#[derive(Ord)]
struct Version {
	major: i32,
	minor: i32,
	revision: i32,
	build: i32
}