C Pass Vector By Reference
Until c 11 the requirements that are imposed on the elements depend on the actual operations performed on the container. For example we can see below program changes made inside the function are not reflected outside because function has a copy.
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By default the allocator class template is used which defines the simplest memory allocation model and is value independent.
C pass vector by reference. But to the language vector is a type and int is also a type. At the call site that usually requires the use of the address operator. When passing structs or classes use const if read only.
Sometimes i do like to pass by pointers if the container will be modified. To a function argument an array of any type including vector is treated as pointer a vector int is not same as int to the compiler vector int is non array non reference and non pointer it is being passed by value and hence it will call copy constructor. Note that v 1 already returns a reference to the second element so you can happily pass individual elements by reference.
When a vector is passed to a function a copy of the vector is created. Aliased as member type vector allocator type. This is a small reminder that the function actually modifies the container.
If you always pass by reference you can t distinguish between modifying and non modifying calls without looking at the function declaration. When we pass an array to a function a pointer is actually passed. It is possible to have a vector of reference wrappers a la std ref but if you don t know what that is you probably shouldn t be using it at this point.
A reference is same object just with a different name and reference must refer to an object. Before swap a 45 b 35 after swap with pass by reference a 35 b 45 difference in reference variable and pointer variable references are generally implemented using pointers. When you need the function to modify an argument.
To pass the value by reference argument reference is passed to the functions just like any other value. Inside the function the referenc. Generally it is required that element type is a complete type and meets the requirements of erasable but many member functions impose stricter requirements.
When you need access to the type information of a fixed array. Aliased as member type vector value type. A vector is functionally same as an array.
When not to use pass by reference. Since references can t be null they are safer to use. When to use pass by reference.
T must meet the requirements of copyassignable and copyconstructible. When passing fundamental types that don t need to be modified use pass by value. Alloc type of the allocator object used to define the storage allocation model.
C function call by reference the call by reference method of passing arguments to a function copies the reference of an argument into the formal parameter.
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