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f2d0a7ea17
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Branches: main, release
library/hash_table.m:
The arrays containing the keys and values are initialized
using the key and value of the first insertion. This was not
being done if the first insertion was done with
hash_table__det_insert rather than hash_table__set.
tests/hard_coded/Mmakefile:
tests/hard_coded/hash_init_bug.{m,exp}:
Test case.
69 lines
1.8 KiB
Mathematica
69 lines
1.8 KiB
Mathematica
:- module hash_init_bug.
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:- interface.
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:- import_module io.
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:- pred main(io__state::di, io__state::uo) is det.
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:- implementation.
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:- import_module assoc_list, exception, hash_table, list.
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:- import_module map, require, std_util, string.
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main(!IO) :-
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HashPred = (pred(Name::in, Hash1::out, Hash2::out) is det :-
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sym_name_to_string(Name, ".", Str),
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Hash1 = hash(Str),
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Hash2 = hash(from_rev_char_list(to_char_list(Str)))
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),
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HT0 = new(HashPred, 10, 0.8),
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build_table(entries, HT0, HT),
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(
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hash_table__search(HT,
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qualified(unqualified("io"), "read_word"), _)
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->
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io__write_string("error: search succeeded\n", !IO)
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;
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io__write_string("search failed as expected\n", !IO)
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).
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:- pred build_table(list(sym_name)::in, name_ht::hash_table_di,
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name_ht::hash_table_uo) is det.
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build_table([], HT, HT).
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build_table([K | T], HT0, HT) :-
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build_table(T, det_insert(HT0, K, 1), HT).
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:- type name_ht == hash_table(sym_name, int).
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:- type sym_name
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---> unqualified(string)
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; qualified(sym_name, string).
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% sym_name_to_string(SymName, Separator, String):
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% convert a symbol name to a string,
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% with module qualifiers separated by Separator.
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:- pred sym_name_to_string(sym_name, string, string).
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:- mode sym_name_to_string(in, in, out) is det.
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sym_name_to_string(SymName, Separator, String) :-
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sym_name_to_string_2(SymName, Separator, Parts, []),
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string__append_list(Parts, String).
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:- pred sym_name_to_string_2(sym_name, string,
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list(string), list(string)).
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:- mode sym_name_to_string_2(in, in, out, in) is det.
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sym_name_to_string_2(qualified(ModuleSpec,Name), Separator) -->
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sym_name_to_string_2(ModuleSpec, Separator),
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[Separator, Name].
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sym_name_to_string_2(unqualified(Name), _) -->
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[Name].
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:- func entries = list(sym_name).
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entries = [
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unqualified("main")
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].
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