C++ equivalent for C-style array

Question

I have heard a lot of guys here saying that C++ is as fast or faster than C in everything, but cleaner and nicer.

While I do not contradict the fact that C++ is very elegant, and quite fast, I did not find any replacement for critical memory access or processor-bound applications.

Question: is there an equivalent in C++ for C-style arrays in terms of performance?

The example below is contrived, but I am interested in the solution for real-life problems: I develop image processing apps, and the amount of pixel processing there is huge.

double t;

// C++ 
std::vector<int> v;
v.resize(1000000,1);
int i, j, count = 0, size = v.size();

t = (double)getTickCount();

for(j=0;j<1000;j++)
{
    count = 0;
    for(i=0;i<size;i++)
         count += v[i];     
}

t = ((double)getTickCount() - t)/getTickFrequency();
std::cout << "(C++) For loop time [s]: " << t/1.0 << std::endl;
std::cout << count << std::endl;

// C-style

#define ARR_SIZE 1000000

int* arr = (int*)malloc( ARR_SIZE * sizeof(int) );

int ci, cj, ccount = 0, csize = ARR_SIZE;

for(ci=0;ci<csize;ci++)
    arr[ci] = 1;

t = (double)getTickCount();

for(cj=0;cj<1000;cj++)
{
    ccount = 0;
    for(ci=0;ci<csize;ci++)
        ccount += arr[ci];      
}

free(arr);

t = ((double)getTickCount() - t)/getTickFrequency();
std::cout << "(C) For loop time [s]: " << t/1.0 << std::endl;
std::cout << ccount << std::endl;

Here is the result:

(C++) For loop time [s]: 0.329069

(C) For loop time [s]: 0.229961

Note: getTickCount() comes from a third-party lib. If you want to test, just replace with your favourite clock measurement

Update:

I am using VS 2010, Release mode, everything else default

Answer 1

Question: is there an equivalent in C++ for C-style arrays in terms of performance?

Answer: Write C++ code! Know your language, know your standard library and use it. Standard algorithms are correct, readable and fast (They know the best how to implement it to be fast on the current compiler).

void testC()
{
    // unchanged
}

void testCpp()
{
    // unchanged initialization

    for(j=0;j<1000;j++)
    {
        // how a C++ programmer accumulates:
        count = std::accumulate(begin(v), end(v), 0);    
    }

    // unchanged output
}

int main()
{
    testC();
    testCpp();
}

Output:

(C) For loop time [ms]: 434.373
1000000
(C++) For loop time [ms]: 419.79
1000000

Compiled with g++ -O3 -std=c++0x Version 4.6.3 on Ubuntu.

For your code my output is similiar to yours. user1202136 gives a good answer about the differences...