core: make hash operators const.

src/core/hash.cpp

@@ -87,42 +87,42 @@ static inline uint32_t Hash64(uint64_t x)
  * Integer hash functions
  */
 
-uint32_t Hash<int8_t>::operator ()(int8_t x)
+uint32_t Hash<int8_t>::operator ()(int8_t x) const
 {
     return Hash8((uint8_t)x);
 }
 
-uint32_t Hash<uint8_t>::operator ()(uint8_t x)
+uint32_t Hash<uint8_t>::operator ()(uint8_t x) const
 {
     return Hash8(x);
 }
 
-uint32_t Hash<int16_t>::operator ()(int16_t x)
+uint32_t Hash<int16_t>::operator ()(int16_t x) const
 {
     return Hash16((uint16_t)x);
 }
 
-uint32_t Hash<uint16_t>::operator ()(uint16_t x)
+uint32_t Hash<uint16_t>::operator ()(uint16_t x) const
 {
     return Hash16(x);
 }
 
-uint32_t Hash<int32_t>::operator ()(int32_t x)
+uint32_t Hash<int32_t>::operator ()(int32_t x) const
 {
     return Hash32((uint32_t)x);
 }
 
-uint32_t Hash<uint32_t>::operator ()(uint32_t x)
+uint32_t Hash<uint32_t>::operator ()(uint32_t x) const
 {
     return Hash32(x);
 }
 
-uint32_t Hash<int64_t>::operator ()(int64_t x)
+uint32_t Hash<int64_t>::operator ()(int64_t x) const
 {
     return Hash64((uint64_t)x);
 }
 
-uint32_t Hash<uint64_t>::operator ()(uint64_t x)
+uint32_t Hash<uint64_t>::operator ()(uint64_t x) const
 {
     return Hash64(x);
 }
@@ -131,18 +131,18 @@ uint32_t Hash<uint64_t>::operator ()(uint64_t x)
  * Floating-point hash functions
  */
 
-uint32_t Hash<half>::operator ()(half f)
+uint32_t Hash<half>::operator ()(half f) const
 {
     return Hash16(f.bits);
 }
 
-uint32_t Hash<float>::operator ()(float f)
+uint32_t Hash<float>::operator ()(float f) const
 {
     union { float tmp; uint32_t x; } u = { f };
     return Hash32(u.x);
 }
 
-uint32_t Hash<double>::operator ()(double f)
+uint32_t Hash<double>::operator ()(double f) const
 {
     union { double tmp; uint64_t x; } u = { f };
     return Hash64(u.x);
@@ -162,12 +162,12 @@ static uint32_t HashCharString(char const *s)
     return ret ^ 0xffffffffu;
 }
 
-uint32_t Hash<char const *>::operator ()(char const *s)
+uint32_t Hash<char const *>::operator ()(char const *s) const
 {
     return HashCharString(s);
 }
 
-uint32_t Hash<String>::operator ()(String const &s)
+uint32_t Hash<String>::operator ()(String const &s) const
 {
     return HashCharString(&s[0]);
 }

src/lol/core/hash.h

@@ -22,30 +22,30 @@ namespace lol
 
 template<typename T> class Hash;
 
-template<> class Hash<int8_t>   { public: uint32_t operator()(int8_t); };
-template<> class Hash<uint8_t>  { public: uint32_t operator()(uint8_t); };
-template<> class Hash<int16_t>  { public: uint32_t operator()(int16_t); };
-template<> class Hash<uint16_t> { public: uint32_t operator()(uint16_t); };
-template<> class Hash<int32_t>  { public: uint32_t operator()(int32_t); };
-template<> class Hash<uint32_t> { public: uint32_t operator()(uint32_t); };
-template<> class Hash<int64_t>  { public: uint32_t operator()(int64_t); };
-template<> class Hash<uint64_t> { public: uint32_t operator()(uint64_t); };
-
-template<> class Hash<half>     { public: uint32_t operator()(half); };
-template<> class Hash<float>    { public: uint32_t operator()(float); };
-template<> class Hash<double>   { public: uint32_t operator()(double); };
-template<> class Hash<ldouble>  { public: uint32_t operator()(ldouble); };
+template<> class Hash<int8_t>   { public: uint32_t operator()(int8_t) const; };
+template<> class Hash<uint8_t>  { public: uint32_t operator()(uint8_t) const; };
+template<> class Hash<int16_t>  { public: uint32_t operator()(int16_t) const; };
+template<> class Hash<uint16_t> { public: uint32_t operator()(uint16_t) const; };
+template<> class Hash<int32_t>  { public: uint32_t operator()(int32_t) const; };
+template<> class Hash<uint32_t> { public: uint32_t operator()(uint32_t) const; };
+template<> class Hash<int64_t>  { public: uint32_t operator()(int64_t) const; };
+template<> class Hash<uint64_t> { public: uint32_t operator()(uint64_t) const; };
+
+template<> class Hash<half>     { public: uint32_t operator()(half) const; };
+template<> class Hash<float>    { public: uint32_t operator()(float) const; };
+template<> class Hash<double>   { public: uint32_t operator()(double) const; };
+template<> class Hash<ldouble>  { public: uint32_t operator()(ldouble) const; };
 
 template<> class Hash<char const *>
 {
 public:
-    uint32_t operator()(char const *x);
+    uint32_t operator()(char const *x) const;
 };
 
 template<> class Hash<String>
 {
 public:
-    uint32_t operator()(String const &s);
+    uint32_t operator()(String const &s) const;
 };
 
 } /* namespace lol */