add const modifiers to train factor

diff --git a/src/lookup/pinyin_lookup.cpp b/src/lookup/pinyin_lookup.cpp
index 2a4d191..8ce68af 100644 (file)
--- a/src/lookup/pinyin_lookup.cpp
+++ b/src/lookup/pinyin_lookup.cpp
@@ -448,7 +448,7 @@ bool PinyinLookup::train_result(PinyinKeyVector keys, CandidateConstraints const
     //TODO: verify the new training method.
     phrase_token_t last_token = sentence_start;
     // constraints->len + 1 == results->len
-    guint32 train_factor = 23 * 5;
+    const guint32 train_factor = 23 * 5;
     for ( size_t i = 0; i < constraints->len; ++i){
        phrase_token_t * token = &g_array_index(results, phrase_token_t, i);
        if ( *token == null_token )