c++ - What is the difference between those ways to create an object? -

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i have class name type. difference between:

1.

type t=a;

2.

type t(a);

where 'a' variable.

and difference between:

3.

type t;

4.

type t();

thank you.

edit: there answers contradict each other. has final answer?

type t=a;

this copy initialization (§8.5/15). requires type has non-explicit constructor taking argument of whatever type a is, or type a implicitly convertible to.

type t(a);

this direct initialization (§8.5/16). t can constructed argument a if corresponding constructor explicit.

type t;

t default initialized (§8.5/12).

type t();

this function declaration function named t returns type value (§8.5/11).


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