1 files changed, 7 insertions, 6 deletions

diff --git a/cpp/nissy.cpp b/cpp/nissy.cpp
index 92b10bd..88df0f2 100644
--- a/cpp/nissy.cpp
+++ b/cpp/nissy.cpp
@@ -18,11 +18,12 @@ extern "C" {
         long long nissy_getcube(long long, long long, long long, long long,
             const char *, char *);
         long long nissy_solverinfo(const char *, char *);
-        long long nissy_gendata(const char *, unsigned long long, char *);
-        long long nissy_checkdata(unsigned long long, const char *);
+        long long nissy_gendata(const char *, unsigned long long,
+            unsigned char *);
+        long long nissy_checkdata(unsigned long long, const unsigned char *);
         long long nissy_solve(const char *, const char *, unsigned, unsigned,
             unsigned, unsigned, unsigned, unsigned, unsigned long long,
-            const char *, unsigned, char *, long long *);
+            const unsigned char *, unsigned, char *, long long *);
         long long nissy_countmoves(const char *);
         long long nissy_setlogger(void (*)(const char *, void *), void *);
 }
@@ -156,7 +157,7 @@ namespace nissy {
         {
                 data.resize(size);
                 auto err = nissy_gendata(name.c_str(),
-                    size, reinterpret_cast<char *>(data.data()));
+                    size, reinterpret_cast<unsigned char *>(data.data()));
                 return error{err};
         }
 
@@ -169,7 +170,7 @@ namespace nissy {
         error solver::check_data()
         {
                 auto err_value = nissy_checkdata(data.size(),
-                    reinterpret_cast<const char *>(data.data()));
+                    reinterpret_cast<const unsigned char *>(data.data()));
                 error err{err_value};
                 data_checked = err.ok();
                 return err;
@@ -199,7 +200,7 @@ namespace nissy {
                 auto err = nissy_solve(cube.to_string().c_str(),
                     name.c_str(), niss.value, minmoves, maxmoves, maxsols,
                     optimal, threads, data.size(),
-                    reinterpret_cast<const char *>(data.data()), len,
+                    reinterpret_cast<const unsigned char *>(data.data()), len,
                     csols.data(), result.stats.data());
                 result.err = error{err};