Fix and outline some comparison operators

src/libstore/content-address.cc

@@ -4,6 +4,24 @@
 
 namespace nix {
 
+bool TextHash::operator ==(const TextHash & otherHash) const noexcept {
+ return hash == otherHash.hash;
+};
+
+bool TextHash::operator !=(const TextHash & otherHash) const noexcept {
+ return hash != otherHash.hash;
+};
+
+
+bool FixedOutputHash::operator ==(const FixedOutputHash & otherHash) const noexcept {
+ return method == otherHash.method && hash == otherHash.hash;
+};
+
+bool FixedOutputHash::operator !=(const FixedOutputHash & otherHash) const noexcept {
+ return method != otherHash.method || hash != otherHash.hash;
+};
+
+
 std::string FixedOutputHash::printMethodAlgo() const
 {
  return makeFileIngestionPrefix(method) + printHashType(hash.type);

src/libstore/content-address.hh

@@ -12,24 +12,16 @@ enum struct FileIngestionMethod : uint8_t {
 
 struct TextHash {
  Hash hash;
- bool operator ==(TextHash otherHash) const noexcept {
- return hash == otherHash.hash;
- };
- bool operator !=(TextHash otherHash) const noexcept {
- return hash != otherHash.hash;
- };
+ bool operator ==(const TextHash & otherHash) const noexcept;
+ bool operator !=(const TextHash & otherHash) const noexcept;
 };
 
 /// Pair of a hash, and how the file system was ingested
 struct FixedOutputHash {
  FileIngestionMethod method;
  Hash hash;
- bool operator ==(FixedOutputHash otherHash) const noexcept {
- return method == otherHash.method && hash == otherHash.hash;
- };
- bool operator !=(FixedOutputHash otherHash) const noexcept {
- return method != otherHash.method && hash == otherHash.hash;
- };
+ bool operator ==(const FixedOutputHash & therHash) const noexcept;
+ bool operator !=(const FixedOutputHash & therHash) const noexcept;
  std::string printMethodAlgo() const;
 };