How to value-initialize an object of a template type in C++03

Question

Suppose I have a function template and want to declare a value-initialized object:

template<typename T>
void foo() {
    // declare and default-initialize 'x' of type 'T'
}

Can I do it?

• T x; fails for primitive types because it leaves them uninitialized,
• T x(); fails because of the most vexing parse
• T x = T(); requires a copy constructor and doesn't require the compiler elide the copy
• T x{}; fails because we're not using C++11.

I'm hoping I'm being an idiot and overlooking something obvious, but I'm not seeing the answer.

Answer 1

Pre c++11

T x = T();

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T3 var3 = {};

The third form, T3 var3 = {} initializes an aggregate, typically a "C-style" struct or a "C-style" array. However, the syntax is not allowed for a class that has an explicitly declared constructor.

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