c++and c read test

#include <iostream>

#include <fstream>

#include <iomanip>

#include <cmath>

#include <cstdio>

#include <sys/time.h>

using namespace std;

template <typename Func>

double benchmark(Func f, size_t iteration) {

f();

timeval a,b;

gettimeofday(&a, 0);

for (; iteration-- > 0;) {

f();

}

gettimeofday(&b, 0);

return (b.tv_sec * (unsigned int)1e6 + b.tv_sec) - (a.tv_sec * (unsigned int)1e6 + a.tv_sec);

}

class CRead {

public:

CRead(char const* filename): _filename(filename) {}

void operator()() {

FILE *file = fopen(_filename, "r");

int cnt = 0;

while (fscanf(file, "%s", _buffer) == 1) {

cnt++;

}

fclose(file);

}

private:

char const* _filename;

char _buffer[1024];

};

class CppRead {

public:

CppRead(char const* filename): _filename(filename), _buffer() {}

enum {

BufferSize = 16184

};

void operator()() {

ifstream file(_filename, ifstream::in);

file.rdbuf()->pubsetbuf(_buffer, BufferSize);

int cnt = 0;

string s;

while (file >> s) {

cnt++;

}

}

private:

char const* _filename;

char _buffer[BufferSize];

};

int main(int argc, char *argv[]) {

size_t iteration = 1;

if (argc > 1)

iteration = atoi(argv[1]);

char const* oldLocale = setlocale(LC_ALL, "C");

if (strcmp(oldLocale, "C") != 0)

cout << "Replace old locale" << oldLocale << " by C \n";

char const* filename = "large.txt";

CRead cread(filename);

CppRead cppread(filename);

bool oldSyncSetting = std::ios_base::sync_with_stdio(false);

double ctime = benchmark(cread, iteration);

double cpptime = benchmark(cppread, iteration);

std::ios_base::sync_with_stdio(oldSyncSetting);

cout << "C :" << ctime << '\n' << "C++:" << cpptime << '\n';

return 0;

}