diff --git a/bin/main.cpp b/bin/main.cpp
index 9750852..0148e7f 100644
--- a/bin/main.cpp
+++ b/bin/main.cpp
@@ -23,6 +23,16 @@ int f(int a)
   return ++a;
 }
 
+int plus(int a) 
+{
+  return a++;
+}
+
+int minus(int a)
+{
+  return a--;
+}
+
 int main(int argc, char *argv[])
 {
   {// ex: string::split_str
@@ -155,4 +165,9 @@ int main(int argc, char *argv[])
     hack::log()(full_name);
     hack::log()(hack::string::str_concat + "super", + "string");
   }
+
+  {// ex: utils::func_concat
+    auto combine ( hack::utils::func_concat(plus, minus) );
+    hack::log("")("func_concat result: ", combine(3));
+  }
 }
diff --git a/src/utils/utils.hpp b/src/utils/utils.hpp
index 86afe66..6b1cfc9 100644
--- a/src/utils/utils.hpp
+++ b/src/utils/utils.hpp
@@ -24,4 +24,23 @@ namespace hack::utils
       return cached->second;
     };
   }
+
+  template<typename T, typename... Args>
+  auto func_concat(T t, Args... args)
+  {
+    if constexpr (sizeof...(args) > 0)
+    {
+      return [=](auto... params)
+      {
+        return t(func_concat(args...)(params...));
+      };
+    }
+    else
+    {
+      return [=](auto... params)
+      {
+        return t(params...);
+      };
+    }
+  }
 }
diff --git a/tests/math.cpp b/tests/math.cpp
new file mode 100644
index 0000000..9019c01
--- /dev/null
+++ b/tests/math.cpp
@@ -0,0 +1,11 @@
+#include <gtest/gtest.h>
+
+#include "math/matrix.hpp"
+
+TEST(matrix, check)
+{
+  hack::matrix<int, 2> m { { 0, 0, 1 }, { 0, 1, 1 } };
+  m[1][1] = 123;
+
+  ASSERT_EQ(m.size(), 3);
+}
diff --git a/tests/meson.build b/tests/meson.build
index 250798e..1449657 100644
--- a/tests/meson.build
+++ b/tests/meson.build
@@ -27,3 +27,12 @@ test(
     dependencies: [ deps, gtest_dep ]
   )
 )
+
+test(
+  'math',
+  executable(
+    'math',
+    'math.cpp',
+    dependencies: [ deps, gtest_dep ]
+  )
+)