Re: "Linus Torvalds Was (Sorta) Wrong About C++"
On 11/03/2015 21:15, Paavo Helde wrote:
JiiPee <no@notvalid.com> wrote in news:Ie1Mw.381530$dX1.143786@fx21.am4:
int size = 10;
int* a = new int[size ];
float* b = new float[size ];
double* c = new double[size ];
This is not exactly equivalent to std::vector because the capacity and
efficient dynamic resizing are missing.
ok but lets assume that project does not need them here....
so in C we need total : 4 bytes overhead
16 bytes, if you want to compare correctly. Each pointer is an overhead.
And if you add capacities, it will make 28 bytes.
yes, forgot them. we dont add capacity....
in C++:
vector<int> a = ...10);
vector<float> b = ...10);
vector<double> c = ..10).;
would need total: 36 bytes of overhead
If the vectors are always of the same length, then the solution is clear:
struct X {
int a;
float b;
double c;
};
std::vector<X> x;
Voila: this has 12 bytes overhead,
which is 4 bytes less than the C
But if you use the same struct with C (which would be fair here), then
you get:
int size = 10;
X* x = new X[size];
With 8 bytes overhead.
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