Structure initialization, huh?!

[turtlemaster]

Can someone explain what this code means? Because I have no idea. I was playing around with structs and found out I can do this...
and does the word 'mystruc' even matter? because if I take it out nothing happens. Did I just create a struc called strucName with an int at value 9? and then what if a few lines down I repeat the code with a different int value but same struct name....

struct mystruc
{
     int x;
} strucName = {9};

[guestgulkan]

See if this helps:
http://www.cplusplus.com/doc/tutorial/structures/

[viliml]

that say nothing about initializer lists! Anyway, any structure or class can be initialized with a so-called "brace-enclosed initializer list" (in your case the 9 within the braces), where the values inside represent the memebers of the structure, in the same order they are declared inside the structure instantation.

[zb0S216C]

Initialisation lists, such as the one used to initialise strucName, is used to initialise each member of the instance. For instance:

struct X
{
    int a_;
    float f_;
} x_ = {1, 2.0f};

The first piece of data in the initialiser-list will be used to initialise x_.a_; the second piece of data will be used to initialise x_.f_. This is only available for POD (Plain Old Data) types.

turtlemaster wrote:

"and does the word 'mystruc' even matter?"

Yes, since that's the type-identifier. You need it for future instantiations. However, if you plan on creating only 1 instance, then you can safely omit it.

turtlemaster wrote:

"and then what if a few lines down I repeat the code with a different int value but same struct name...."

That would result in an error, even with std::initializer_list.

_Wazzak

[turtlemaster]

Thanks for your responses ^__^