How to Aggregate Vector Functions
In the C++ programming language, vector functions are pointers to functions that return vectors. Vectors are a data containment device used to store data serially, but allow random access. Function pointers are often used as arguments to functions themselves, such as passing a sorting function pointer into a sorting function. As such, you may need to collect, or aggregate, all of the vector functions you wish to use. This can be done with a simple container.
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Instructions
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Load the C++ Integrated Development Environment by clicking on its program icon. When it opens, select "File," "New," "Project" and choose "C++ Project" to create a new C++ project. A blank source code file appears in the text editor portion of the IDE.
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Write the following text at the top of the source code file in order to import the following libraries:
#include <iostream>
#include <vector>
using namespace std;
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Write the following to declare a vector function:
vector<int> vectorFunction(){ vector<int> returnVecotr; return returnVector;}
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Declare a main function. The main function is where your program begins execution. You can place all your program code in between the curly brackets that follow the main function declaration:
int main()
{}
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Write a statement in between the curly brackets of the main function that defines an aggregation of vectors:
vector<vector<int> > aggregation;
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Write the logic for a "for" loop, a construct that repeats its nested code block a set number of times:
for(int i = 0; i < 10; i++)
{}
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Write the following vector declaration in between the curly brackets of the "for" loop. This declares a function pointer named "foo" that points to a function that returns vectors of integer data types.
vector<int> (*foo)();
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Write the following to initialize the pointer function. This is done by setting it equal to the address of the function "vectorFunction."
foo = & vectorFunction
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Write the following code to push the vector into the aggregation vector. The aggregation collects all the vector pointer functions in a nice collection.
aggregation.push_back(foo);
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