C++ and STL
C++ in a nutshell
#include <iostream>
int main() {
/* Variables */
int integer_variable;
double read_variable;
bool boolean_variable;
/* Operations */
a = b + c - d * e / f;
i = j % k;
a += b;
a -= b;
a *= b;
a /= b;
i %= j;
/* Conditions */
if (a == b and c != d) { /* ... */ }
elseif (a >= b and c <= d) { /* ... */ }
else { /* ... */ }
/* Loops */
while (condition == true) { /* ... */ }
for (unsigned int i = 0; i < 10; ++i) { /* ... */ }
do {
/* ... */
} while (condition == true);
/* Displaying text */
std::cout << "Hello world!" << std::endl;
return 0;
}
STL in a nutshell
#include <vector>
#include "TH1D.h"
{
/* Create an empty vector of TH1Ds */
std::vector< TH1D* > th1ds;
/* Add a TH1D to the vector */
th1ds.push_back(new TH1D("name", "Title", 1000, 0., 0.));
/* Access the TH1D */
th1ds.at(0)->Fill(value);
/* Or */
TH1D* histogram = new TH1D("hist_gaus", "Gaussian distribution;X;Number of events", 1000, -10., 10.);
th1ds.push_back(histogram);
histogram->Fill(value);
/* Go over the elements of a vector */
for (unsigned int i = 0; i < th1ds.size(); ++i) {
th1ds.at(i)->Write();
}
}