replace erase() with clear() to make imported keylist deconstruction faster

Author: jiangyujie.jyj

obj_gen.cpp

@@ -527,12 +527,11 @@ imported_keylist::imported_keylist(const char *filename)
 {
 }
 
-imported_keylist::~imported_keylist()
-{
-    while (!m_keys.empty()) {
-        free(m_keys.front());
-        m_keys.erase(m_keys.begin());
+imported_keylist::~imported_keylist() {
+    for (unsigned int i = 0; i < m_keys.size(); i++) {
+        free(m_keys[i]);
     }
+    m_keys.clear();
 }
 
 bool imported_keylist::read_keys(void)