Why doesn't Xcode recognize free() and malloc() in this .cpp file? - c++

Question

I have many .cpp files in my project that work. But this one irritates Xcode or the compiler.
It doesn't recognise free() and malloc() but this is also C. What can be wrong?
Header ssdpmessage.h looks like this:
#ifndef _SSDPMESSAGE_H
#define _SSDPMESSAGE_H
#include "ssdptools.h"
#include <vector>
#include <arpa/inet.h>
#include "ssdpdb.h"
class SSDPMessage{
public:
SSDPMessage();
virtual ~SSDPMessage();
//What type of message can we handle
virtual SSDP_TYPE GetType()=0;
//Get the message dignature implemented in this class
virtual std::vector<SSDP_HTTP_HEADER*> GetHeaderSignature();
//Can this class parse the message with this signature ?
virtual u8 CanProcess(std::vector<SSDP_HTTP_HEADER*> msgheaders);
//Process the message, return value:
//0 : processed
//1 : not for me, search for another to process
//<0 : message was for me but there is an error
virtual int Process(struct sockaddr* sender, std::vector<SSDP_HTTP_HEADER*> msgheaders)=0;
//ReInit all members
virtual void ReInit()=0;
virtual SSDPDB* GetDB();
virtual void SetDB(SSDPDB* db);
private:
std::vector<SSDP_HTTP_HEADER*> mHeaderSignature;
protected:
int AddSignatureHeader(char* fieldname, char* fieldvalue);
SSDPDB *mDB;
private:
SSDPMessage(const SSDPMessage &src);
SSDPMessage& operator= (const SSDPMessage &src);
};
#endif //_SSDPMESSAGE_H
The includes and affected code in ssdpmessage.cpp look like this:
#include "ssdpmessage.h"
SSDPMessage::SSDPMessage():mDB(NULL){
}
SSDPMessage::~SSDPMessage(){
std::vector<SSDP_HTTP_HEADER*>::iterator it;
for(it=mHeaderSignature.begin(); it<mHeaderSignature.end(); it++){
free(*it);
}
mHeaderSignature.clear();
}
int SSDPMessage::AddSignatureHeader(char* fieldname, char* fieldvalue){
SSDP_HTTP_HEADER *thisHeader = (SSDP_HTTP_HEADER*)malloc(sizeof(SSDP_HTTP_HEADER));
thisHeader->fieldname = (u8*)fieldname;
thisHeader->fieldnamelen = strlen(fieldname);
thisHeader->fieldvalue = (u8*)fieldvalue;
thisHeader->fieldvaluelen = strlen(fieldvalue);
mHeaderSignature.push_back(thisHeader);
return mHeaderSignature.size();
}
This is code from the upnpx library. It works without problem in the demo project of the library.

Answer 1

malloc requires you to include cstdlib.