无法从大括号括起来的初始化列表转换为std :: vector

Question

I saw a lot of similar questions, but I don't think I saw quite the same one. It's pretty basic. Some code from my lecturer is failing to compile, and I distilled the problem to this test case:

void foo(vector<int> v) {
}

void fooUsage() {
    foo({0, 1, 2});
}

This fails with:

could not convert '{0, 1, 2}' from '<brace-enclosed initializer list>' to 'std::vector<int>

Note: It works on GCC 5.0.0 20141228 but fails on my GCC 4.7.1 (tdm-1).

Sorry if this is too basic but I don't know C++11 very well.

Answer 1

这是已知的错误，已在gcc 4.8中修复 。

Answer 2

It turns out I only needed to add -std=c++11 to the gcc command line.

Note: I was mistakenly thinking that this is on by default, since I was also getting some warnings like this:

extended initializer lists only available with -std=c++11 or -std=gnu++11 [enabled by default]

See how it says "enabled by default"? That's what was misleading me.