1 files changed, 17 insertions, 0 deletions
diff --git a/third_party/nix/src/libexpr/primops.hh b/third_party/nix/src/libexpr/primops.hh
new file mode 100644
index 000000000000..ab5f64720273
--- /dev/null
+++ b/third_party/nix/src/libexpr/primops.hh
@@ -0,0 +1,17 @@
+#include <tuple>
+#include <vector>
+
+#include "libexpr/eval.hh"
+
+namespace nix {
+
+struct RegisterPrimOp {
+  using PrimOps = std::vector<std::tuple<std::string, size_t, PrimOpFun> >;
+  static PrimOps* primOps;
+  /* You can register a constant by passing an arity of 0. fun
+     will get called during EvalState initialization, so there
+     may be primops not yet added and builtins is not yet sorted. */
+  RegisterPrimOp(const std::string& name, size_t arity, PrimOpFun fun);
+};
+
+}  // namespace nix