How Can I Simplify std::vector Initialization in C ?

Simplifying std::vector Initialization

When working with arrays in C , initialization is often straightforward:

int a[] = {10, 20, 30};

However, initializing a std::vector can be more cumbersome using the push_back() method:

std::vector<int> ints;

ints.push_back(10);
ints.push_back(20);
ints.push_back(30);

C 11 Solution (with Support)

If your compiler supports C 11, you can utilize initializer lists:

std::vector<int> v = {1, 2, 3, 4};

This is available in GCC versions 4.4 and above.

Alternative Option (with Boost.Assign)

For older compilers, the Boost.Assign library offers a non-macro solution:

#include <boost/assign/list_of.hpp>
...
std::vector<int> v = boost::assign::list_of(1)(2)(3)(4);

Or, using Boost.Assign's operators:

#include <boost/assign/std/vector.hpp>
using namespace boost::assign;
...
std::vector<int> v;
v += 1, 2, 3, 4;

Keep in mind that Boost.Assign may have performance overhead compared to manual initialization.

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