xcode - C++ error EXC_BAD_ACCESS static void assign -

i c++ newbie, can find way through code of time. question might stupid, stuck.

i trying add javascript bindings particlesystem::initwithfile function in cocos2d-x 3.0beta2 , running on ios simulator.

xcode breaks @

    _libcpp_inline_visibility     static void assign(char_type& __c1, const char_type& __c2) _noexcept     {__c1 = __c2;} 

this function added javascript bindings.

jsbool js_cocos2dx_particlesystem_initwithfile(jscontext *cx, uint32_t argc, jsval *vp) {     jsval *argv = js_argv(cx, vp);     jsbool ok = js_true;     jsobject *obj = js_this_object(cx, vp);     js_proxy_t *proxy = jsb_get_js_proxy(obj);     cocos2d::particlesystem* cobj = (cocos2d::particlesystem *)(proxy ? proxy->ptr : null);     jsb_precondition2( cobj, cx, js_false, "js_cocos2dx_particlesystem_initwithfile : invalid native object");     if (argc == 1) {         std::string arg0;         ok &= jsval_to_std_string(cx, argv[0], &arg0);         jsb_precondition2(ok, cx, js_false, "error processing arguments");          cobj->initwithfile(arg0);         js_set_rval(cx, vp, jsval_void);         return js_true;     }      js_reporterror(cx, "js_cocos2dx_particlesystem_setstartradiusvar : wrong number of arguments: %d, expecting %d", argc, 1);     return js_false; } 

and function breaks is

bool particlesystem::initwithfile(const std::string& plistfile) {     bool ret = false;     _plistfile = fileutils::getinstance()->fullpathforfilename(plistfile);     valuemap dict = fileutils::getinstance()->getvaluemapfromfile(_plistfile.c_str());      ccassert( !dict.empty(), "particles: file not found");      // xxx compute path path, should define function somewhere     string listfilepath = plistfile;     if (listfilepath.find('/') != string::npos)     {         listfilepath = listfilepath.substr(0, listfilepath.rfind('/') + 1);         ret = this->initwithdictionary(dict, listfilepath.c_str());     }     else     {         ret = this->initwithdictionary(dict, "");     }      return ret; } 

problem seems plistfile variable.

update: line in particlesystem::initwithfile method, goes std::string templates

template <class _chart, class _traits, class _allocator> _libcpp_inline_visibility inline basic_string<_chart, _traits, _allocator>& basic_string<_chart, _traits, _allocator>::operator=(basic_string&& __str)     _noexcept_(__alloc_traits::propagate_on_container_move_assignment::value &&                is_nothrow_move_assignable<allocator_type>::value) {     __move_assign(__str, integral_constant<bool,           __alloc_traits::propagate_on_container_move_assignment::value>());     return *this; } 

and to

template <class _chart, class _traits, class _allocator> _libcpp_inline_visibility inline void basic_string<_chart, _traits, _allocator>::__move_assign(basic_string& __str, true_type)     _noexcept_(is_nothrow_move_assignable<allocator_type>::value) {     clear();     shrink_to_fit();     __r_.first() = __str.__r_.first();     __move_assign_alloc(__str);     __str.__zero(); } 

and then

template <class _chart, class _traits, class _allocator> _libcpp_inline_visibility inline void basic_string<_chart, _traits, _allocator>::clear() _noexcept {     __invalidate_all_iterators();     if (__is_long())     {         traits_type::assign(*__get_long_pointer(), value_type());         __set_long_size(0);     }     else     {         traits_type::assign(*__get_short_pointer(), value_type());         __set_short_size(0);     } } 

and finally

_libcpp_inline_visibility static void assign(char_type& __c1, const char_type& __c2) _noexcept     {__c1 = __c2;} 

here screenshot of xcode