How Can I Elegantly Initialize a std::vector with Hardcoded Elements in C ?

Elegant Initialization of std::vector with Hardcoded Elements

While it's straightforward to initialize an array in C , e.g., int a[] = {10, 20, 30}, initializing a std::vector in a similar fashion may seem cumbersome. Here are two elegant ways to achieve the same result:

C 11 Initializer List

In C 11 and later, you can use initializer lists to initialize a std::vector directly:

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

This syntax is supported by GCC from version 4.4. However, VC 2010 does not yet support this feature.

Boost.Assign Library

Alternatively, the Boost.Assign library provides a convenient way to initialize a std::vector:

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

Or:

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

Note that the latter syntax involves a slight overhead due to internal use of a std::deque. Therefore, for performance-critical code, consider using the std::vector initializer list directly, as suggested by Yacoby in the original question.

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