vector initializer: disallowed in field declaration until c++11

in a field declaration, you face restrictions:

vector<int> vec; //acceptable
vector<int> vec(9); // field initialization, disallowed until C++11. See https://stackoverflow.com/questions/24149924/has-the-new-c11-member-initialization-feature-at-declaration-made-initializati

You can write this kinda code in a *local* variable definition though.

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