2 files changed, 24 insertions, 0 deletions

diff --git a/cpp/nissy.cpp b/cpp/nissy.cpp
index 2c290a6..90fcf20 100644
--- a/cpp/nissy.cpp
+++ b/cpp/nissy.cpp
@@ -24,6 +24,7 @@ extern "C" {
             const unsigned char *, unsigned, char *, long long *,
             int (*)(void *), void *);
         long long nissy_countmoves(const char *);
+        long long nissy_comparemoves(const char *, const char *);
         long long nissy_setlogger(void (*)(const char *, void *), void *);
 }
 
@@ -53,6 +54,9 @@ namespace nissy {
         const status status::STOP{1};
         const status status::PAUSE{2};
 
+        const compare_result compare_result::EQUAL{0};
+        const compare_result compare_result::DIFFERENT{99};
+
         namespace size {
                 constexpr size_t CUBE = 24;
                 constexpr size_t TRANSFORMATION = 12;
@@ -210,6 +214,16 @@ namespace nissy {
                 return error{err};
         }
 
+        std::variant<error, compare_result>
+        compare_moves(const std::string& m1, const std::string& m2)
+        {
+                auto cmp = nissy_comparemoves(m1.c_str(), m2.c_str());
+                if (cmp < 0)
+                        return error{cmp};
+                else
+                        return compare_result{cmp};
+        }
+
         void set_logger(void (*log)(const char *, void *), void *data)
         {
                 nissy_setlogger(log, data);
diff --git a/cpp/nissy.h b/cpp/nissy.h
index 817307c..199af10 100644
--- a/cpp/nissy.h
+++ b/cpp/nissy.h
@@ -55,6 +55,14 @@ namespace nissy {
                 static const status PAUSE;
         };
 
+        class compare_result {
+        public:
+                long long value;
+
+                static const compare_result EQUAL;
+                static const compare_result DIFFERENT;
+        };
+
         class cube {
         public:
                 cube();
@@ -103,6 +111,8 @@ namespace nissy {
         };
 
         error count_moves(const std::string&);
+        std::variant<error, compare_result> compare_moves(
+            const std::string&, const std::string&);
         void set_logger(void (*)(const char *, void *), void *);
 }