std::ifstream infile;

std::string line;

	int j = 0, m = 0;

	infile.open(filename);

	if (infile == NULL) return 1;

while (!infile.eof())
{
	getline(infile, line);

	for (int it = 0; it < line.length(); it++)
	{
		m++;
	}
	j++;
}

infile.close();

FILE * pFile;
	long lSize;
	char * buffer;
	size_t result;

	pFile = fopen ( filename , "rb" );
	if (pFile==NULL) 
	{
		fputs ("File error",stderr); 
		exit (1);
	}

	// obtain file size:
	fseek (pFile , 0 , SEEK_END);
	lSize = ftell (pFile);
	//rewind (pFile);

	// allocate memory to contain the whole file:
	buffer = (char*) malloc (sizeof(char)*lSize);

	if (buffer == NULL) 
	{
		fputs ("Memory error",stderr); 
		exit (2);
	}

	fseek(pFile, 0, SEEK_SET);

	if (lSize != fread(buffer, 1, lSize, pFile))
	{
		free(buffer);
		fclose(pFile);
		fputs("different size", stderr);
		return -1;
	}

	// terminate
	fclose (pFile);


	free (buffer);

	
for(int i=0;i < lSize;i++)
	{
		 ch = buffer[i];
		 j++;
	}

1)
with open(filename) as fi:
	for line in fi:
		for sym in line:
			i += 1


		
2)
for l in tailer.head(open(filename), lines=100000):
	for sym in l:
		s = sym
		i+= 1
	
3)
with open(filename, "r+b") as f:
	mm = mmap.mmap(f.fileno(), 0)
	for line in iter(mm.readline, ""):
		for sym in line:
			s = sym
			i+= 1
	mm.close()
	
4)
for line in open(filename, 'r').readlines():
	for sym in line:
		s = sym

5)
with open(filename, "r+b") as f:
	while 1:
		lines = f.readlines(100000)
		if not lines: break
		for line in lines:
			for sym in line:
				s = sym
				i+= 1

from ctypes import * 
import ctypes.util

import time 

t1 = time.time()

libc = cdll.LoadLibrary(ctypes.util.find_library('c'))
fopen = libc.fopen
fread = libc.fread
fseek = libc.fseek
ftell = libc.ftell
fclose = libc.fclose
free = libc.free

fread.argtypes = [c_void_p, c_size_t, c_size_t, c_void_p]

fh = fopen(fllename, "rb")
fseek(fh, 0 , 2) # SEEK_END = 2
size = ftell(fh)
fseek(fh, 0 , 0) # SEEK_SET = 0


buf = create_string_buffer(size)
fread(buf, 1, size, fh)

i = 0
st = ''
for m in buf:
	i += 1
	
print i

print "time: " + str(time.time() - t1)

fclose(fh)
free(buf)