memory.hpp

/*
This is the only utilisy that is operating-system dependent !
*/
 
#pragma once
 
namespace quids::utils {
    #ifdef __CYGWIN__ // windows systems
 
    #include <windows.h>
 
    size_t inline get_free_mem() {
        MEMORYSTATUSEX statex;
        statex.dwLength = sizeof (statex);
        GlobalMemoryStatusEx (&statex);
 
        return statex.AvailPageFile; // free virtual memory instead of free physical memory...
    }
 
    #elif defined(__linux__) // linux systems
 
    size_t inline get_free_mem() {
        char buff[128];
        char useless[128];
        unsigned long free_mem = 0;
 
        FILE *fd = fopen("/proc/meminfo", "r");
 
        fgets(buff, sizeof(buff), fd); 
        fgets(buff, sizeof(buff), fd); 
        sscanf(buff, "%s %lu ", useless, &free_mem); 
 
        return free_mem * 1000; 
    }
 
    #elif defined(__unix__) // other unix systems
        #error "UNIX system other than LINUX aren't supported for now"
    #elif defined(__MACH__) // mac os systems
        #error "macos isn't supported for now !"
    #else // other systems
        #error "system isn't supported"
 
        size_t inline get_free_mem() { return 0; }
    #endif
}