c++ - Return throwing ternary operator?

Question

Reading the documentation of the ternary operator, I've realized that there are two special cases that I've never used:

• you can use it with functions that return void : bool ? void : void
• you can throw inside a ternary operator

So is the following valid, completely defined, and oftenly used (assuming that this is a class member, and the class owns a Type _data[Size]) ?

Type& at(const unsigned int i) 
{
    return (i < Size) ? (_data[i]) : (throw std::out_of_range("ERROR"));
}

Answer 1

Size您的示例是有效且定义明确的（假设和的适当定义_data）。至于“经常使用” - 我个人以前从未见过这样的构造，因为它的价值。