Handle floating to boolean cast

Author: lucic71

cpp2rust/converter/converter.cpp

@@ -2710,6 +2710,7 @@ bool Converter::VisitImplicitCastExpr(clang::ImplicitCastExpr *expr) {
     Convert(sub_expr);
     break;
   case clang::CastKind::CK_IntegralToBoolean:
+  case clang::CastKind::CK_FloatingToBoolean:
     ConvertIntegralToBooleanCast(expr);
     break;
   case clang::CastKind::CK_PointerToBoolean:

cpp2rust/converter/converter_lib.cpp

@@ -2131,6 +2131,8 @@ clang::Expr *NormalizeToBool(clang::Expr *expr, clang::ASTContext &ctx) {
   clang::CastKind cast_kind;
   if (expr->getType()->isPointerType()) {
     cast_kind = clang::CK_PointerToBoolean;
+  } else if (expr->getType()->isFloatingType()) {
+    cast_kind = clang::CK_FloatingToBoolean;
   } else /* expr->getType()->isIntegerType() */ {
     cast_kind = clang::CK_IntegralToBoolean;
   }

tests/unit/expr_as_bool_cpp.cpp

@@ -66,5 +66,14 @@ int main() {
   }
   assert(d == 0.0);
 
+  float f = 2.0f;
+  bool fb = f;
+  bool nf = !f;
+  assert(fb);
+  assert(!nf);
+  assert(!0.0);
+  int fi = (bool)f;
+  assert(fi == 1);
+
   return 0;
 }