From 74a8a2b10a0513f5346ec47aa9b463e30f2b972e Mon Sep 17 00:00:00 2001
From: hachem <im@hachem.wtf>
Date: Sat, 19 Sep 2026 12:03:34 +0200
Subject: feat: add void, int32_t, byte, size_t, remove_cv_t

---
 ast.h                 |  5 +++++
 eval.c                | 16 ++++++++++++++--
 eval.h                |  3 +++
 examples/types.sfinae |  5 +++++
 sfinae.l              |  5 +++++
 sfinae.y              | 17 ++++++++++++++++-
 6 files changed, 48 insertions(+), 3 deletions(-)
 create mode 100644 examples/types.sfinae

diff --git a/ast.h b/ast.h
index 778a765..52814d5 100644
--- a/ast.h
+++ b/ast.h
@@ -3,6 +3,11 @@
 enum NodeKind
 {
     NODE_CHAR,
+    TYPE_VOID,
+    TYPE_INT32,
+    TYPE_BYTE,
+    TYPE_SIZE,
+    TYPE_REMOVE_CV,
     TYPE_DECLTYPE,
     VALUE_DIFFERENCE,
     VALUE_SUM,
diff --git a/eval.c b/eval.c
index f9f47b6..3c4ea34 100644
--- a/eval.c
+++ b/eval.c
@@ -63,6 +63,11 @@ static int evaluate_type(const struct Node* node, struct Type* out)
     out->number = 0;
     switch (node->kind)
     {
+        case TYPE_VOID: return 0;
+        case TYPE_INT32: out->kind = KIND_INT32; return 0;
+        case TYPE_BYTE: out->kind = KIND_BYTE; return 0;
+        case TYPE_SIZE: out->kind = KIND_SIZE; return 0;
+        case TYPE_REMOVE_CV: return evaluate_type(node->first, out);
         case TYPE_DECLTYPE:
             if (evaluate_value(node->first, &out->number))
                 return 1;
@@ -81,8 +86,15 @@ static enum RunStatus emit(const struct Node* node)
     if (evaluate_type(node->first, &type))
         return RUN_FAILED;
 
-    if (type.kind == KIND_VALUE)
-        (void)printf("%" PRId64 "\n", type.number);
+    switch (type.kind)
+    {
+        case KIND_VOID: break;
+        case KIND_INT32: (void)printf("int32_t\n"); break;
+        case KIND_BYTE: (void)printf("byte\n"); break;
+        case KIND_SIZE: (void)printf("size_t\n"); break;
+        case KIND_VALUE: (void)printf("%" PRId64 "\n", type.number); break;
+    }
+
     return RUN_DONE;
 }
 
diff --git a/eval.h b/eval.h
index 49101f1..3c5d947 100644
--- a/eval.h
+++ b/eval.h
@@ -7,6 +7,9 @@
 enum TypeKind
 {
     KIND_VOID,
+    KIND_INT32,
+    KIND_BYTE,
+    KIND_SIZE,
     KIND_VALUE
 };
 
diff --git a/examples/types.sfinae b/examples/types.sfinae
new file mode 100644
index 0000000..7adb870
--- /dev/null
+++ b/examples/types.sfinae
@@ -0,0 +1,5 @@
+// a type that carries no value emits its name, because why would it print a number
+::emit<::int32_t>::commit;
+::emit<::remove_cv_t<::byte>>::commit;
+::emit<::size_t>::commit;
+::emit<::void>::commit;
diff --git a/sfinae.l b/sfinae.l
index 5857a2b..37ddd1a 100644
--- a/sfinae.l
+++ b/sfinae.l
@@ -34,6 +34,11 @@ static int fail(const char* message)
 "::"                    return TOK_COLONCOLON;
 "emit"                  return TOK_EMIT;
 "commit"                return TOK_COMMIT;
+"void"                  return TOK_VOID;
+"int32_t"               return TOK_INT32;
+"byte"                  return TOK_BYTE;
+"size_t"                return TOK_SIZE_T;
+"remove_cv_t"           return TOK_REMOVE_CV;
 "decltype"              return TOK_DECLTYPE;
 "difference"            return TOK_DIFFERENCE;
 "sum"                   return TOK_SUM;
diff --git a/sfinae.y b/sfinae.y
index 3e7c9b1..5a590a2 100644
--- a/sfinae.y
+++ b/sfinae.y
@@ -18,6 +18,11 @@ void yyerror(const char* message);
 %token TOK_COLONCOLON
 %token TOK_EMIT
 %token TOK_COMMIT
+%token TOK_VOID
+%token TOK_INT32
+%token TOK_BYTE
+%token TOK_SIZE_T
+%token TOK_REMOVE_CV
 %token TOK_DECLTYPE
 %token TOK_DIFFERENCE
 %token TOK_SUM
@@ -47,7 +52,17 @@ statement
     ;
 
 type
-    : TOK_COLONCOLON TOK_DECLTYPE '(' value ')'
+    : TOK_COLONCOLON TOK_VOID
+        { $$ = node_leaf(TYPE_VOID); }
+    | TOK_COLONCOLON TOK_INT32
+        { $$ = node_leaf(TYPE_INT32); }
+    | TOK_COLONCOLON TOK_BYTE
+        { $$ = node_leaf(TYPE_BYTE); }
+    | TOK_COLONCOLON TOK_SIZE_T
+        { $$ = node_leaf(TYPE_SIZE); }
+    | TOK_COLONCOLON TOK_REMOVE_CV '<' type '>'
+        { $$ = node_unary(TYPE_REMOVE_CV, $4); }
+    | TOK_COLONCOLON TOK_DECLTYPE '(' value ')'
         { $$ = node_unary(TYPE_DECLTYPE, $4); }
     ;
 
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