work on open hashmaps

stanford hash for int keys <= 4byte.
swisstable for strings and the rest.
greg7mdp/parallel-hashmap for multithreaded later.

See GH #18

GNUmakefile

@@ -131,6 +131,7 @@ TESTS = \
 	tests/func/test_unordered_set_power2 \
 	tests/func/test_unordered_set_cached \
 	tests/func/test_unordered_set_sleep \
+	tests/func/test_swisstable \
 	tests/func/test_double_array \
 	tests/func/test_int_vector \
 	tests/func/test_vec_capacity \
@@ -345,6 +346,9 @@ tests/func/test_unordered_set_sleep: .cflags $(COMMON_H) tests/test.h ctl/unorde
 tests/func/test_unordered_map: .cflags $(H) tests/test.h tests/func/strint.hh \
                           tests/func/test_unordered_map.cc
 	$(CXX) $(CXXFLAGS) -o $@ [email protected]
+tests/func/test_swisstable: .cflags $(H) tests/test.h tests/func/strint.hh \
+                          tests/func/test_swisstable.cc
+	$(CXX) $(CXXFLAGS) -o $@ [email protected]
 tests/func/test_stack:    .cflags $(COMMON_H) tests/test.h tests/func/digi.hh ctl/stack.h ctl/deque.h \
                           tests/func/test_stack.cc
 	$(CXX) $(CXXFLAGS) -o $@ [email protected]

ctl/bits/container.h

@@ -2,15 +2,18 @@
    SPDX-License-Identifier: MIT */
 
 // DO NOT STANDALONE INCLUDE.
+// clang-format off
 #if !defined CTL_LIST && \
     !defined CTL_SLIST && \
     !defined CTL_SET && \
     !defined CTL_USET && \
+    !defined CTL_UMAP && \
     !defined CTL_VEC && \
     !defined CTL_ARR && \
     !defined CTL_DEQ
 #error "No CTL container defined for <ctl/bits/container.h>"
 #endif
+// clang-format on
 
 // FIXME once per A
 //#ifndef CAT(HAVE, JOIN(T, it_vtable))