datetimestamp.h

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#ifndef DATETIMESTAMP_H
#define DATETIMESTAMP_H
 
#include <dlfcn.h>
#include <sys/stat.h>
#include <time.h>
#include <string>
 
inline std::string datetimestamp_addr(const void* address)
{
    Dl_info info;
 
    struct stat st;
 
    if ( dladdr( address, &info )==0 || info.dli_fname==0 || stat( info.dli_fname, &st )!=0 ) return "???";
    
    std::string stime( 25, '\0' );
    
    ctime_r( &st.st_mtime, &stime[0] );
    stime.pop_back();
 
    return stime;
}
 
template<typename T, typename... Args>
std::string datetimestamp(T (*func)(Args...)) { return datetimestamp_addr((void*)(func)); }
 
template<typename T>
struct timestamp { static void stamper() {} };
 
template<typename T>
std::string datetimestamp(const T* /* t */ ) { return datetimestamp_addr((void*)(&timestamp<T>::stamper)); }
 
 
#endif // DATETIMESTAMP_H