c++ - C4716 function must return a value thown despite returning a value -

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the problem compiler (mingw32) insists there compilier error @ line 21 in "util.h".

#ifndef util_h #define util_h #include <string> #include <list> #include "treeitem.h" using namespace std;  #include <algorithm> #include <functional> #include <cctype> #include <locale> #include <qlist>   static inline string &ltrim(string &s){} static inline string &rtrim(string &s){} static inline string &trim(string &s){} static inline string func_1(string txt,size_t start, size_t end){} static inline size_t func_2(string txt, size_t index){} static inline string replace(string& str, const string& from, const string& to){} vector<treeitem *> parse(string dat){}  #endif // util_h

line 21 placeholder function in "util.cpp". (snippet of util.cpp)

vector<treeitem *> parse(string dat) {     vector<treeitem *> final {};     while (dat.find("{") <= dat.length()){         treeitem * temp = new treeitem;         temp->settext(qstring::fromstdstring(replace(replace(replace(replace(trim(func_1(dat,0,dat.find('{'))),"\n","")," ",""),"}",""),"=","")));         qlist<treeitem *> ref = parse(func_1(dat, dat.find("{")+1,func_2(dat,dat.find('{'))));          for(int j = 0; j < ref.size(); j++)         {             temp->setparent(ref.at(j));             final.push_back(temp);             dat = func_1(dat,func_2(dat,dat.find('{')),dat.length());         }     }     return final; }

obviously returns compiler shouldn't giving error. isn't problem loop evaluating true because if move "return final;" in front of loop still throws error.

the problems in lines:

static inline string &ltrim(string &s){} static inline string &rtrim(string &s){} static inline string &trim(string &s){} static inline string func_1(string txt,size_t start, size_t end){} static inline size_t func_2(string txt, size_t index){} static inline string replace(string& str, const string& from, const string& to){} vector<treeitem *> parse(string dat){}

all of them provide empty implementation, not declarations. if want them declarations, need replace {} ;.

static inline string &ltrim(string &s); static inline string &rtrim(string &s); static inline string &trim(string &s); static inline string func_1(string txt,size_t start, size_t end); static inline size_t func_2(string txt, size_t index); static inline string replace(string& str, const string& from, const string& to); vector<treeitem *> parse(string dat);

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