C++ Vector to CSV by adding Comma after each element

Question

vector v;
v.push_back(\"A\");
v.push_back(\"B\");
v.push_back(\"C\");
v.push_back(\"D\");

for (vector::iterator it = v.begin(); it!=v.end()         


        

Answer 1

To avoid the trailing comma, loop until v.end() - 1, and output v.back() for instance:

#include 
#include 
#include 
#include 
#include 

template 
void Out(const std::vector& v)
{
    if (v.size() > 1)
        std::copy(v.begin(), v.end() - 1, std::ostream_iterator(std::cout, ", ")); 
    if (v.size())
        std::cout << v.back() << std::endl;
}
int main()
{
    const char* strings[] = {"A", "B", "C", "D"};
    Out(std::vector(strings, strings + sizeof(strings) / sizeof(const char*)));

    const int ints[] = {1, 2, 3, 4};
    Out(std::vector(ints, ints + sizeof(ints) / sizeof(int)));
}

BTW you posted:

vector v; 
//...
for (vector::iterator it = v.begin(); //...

which is unlikely to compile :)