random header in C++ | Set 1(Generators)

std::generate in C++

Last Updated : 21 Jul, 2017

std::generate, as the name suggests is an STL algorithm, which is used to generate numbers based upon a generator function, and then, it assigns those values to the elements in the container in the range [first, last). The generator function has to be defined by the user, and it is called successively for assigning the numbers. Template function:

void generate (ForwardIterator first, ForwardIterator last, Generator gen);

first: Forward iterator pointing to the first element of the container.
last: Forward iterator pointing to the last element of the container.
gen: A generator function, based upon which values will be assigned.

Returns: none
Since, it has a void return type, so it does not return any value.

CPP

// C++ program to demonstrate the use of std::generate
#include <iostream>
#include <vector>
#include <algorithm>

// Defining the generator function
int gen()
{
    static int i = 0;
    return ++i;
}

using namespace std;
int main()
{
    int i;

    // Declaring a vector of size 10
    vector<int> v1(10);

    // using std::generate
    std::generate(v1.begin(), v1.end(), gen);

    vector<int>::iterator i1;
    for (i1 = v1.begin(); i1 != v1.end(); ++i1) {
        cout << *i1 << " ";
    }
    return 0;
}

Output:

1 2 3 4 5 6 7 8 9 10

Next: std::generate_n in C++

random header in C++ | Set 1(Generators)

M

Mrigendra Singh

Improve

Article Tags :

Practice Tags :

Similar Reads

std::generate_n in C++

std::generate is an STL algorithm, which is used to generate numbers based upon a generator function, and then, it assigns those values to the elements in the container in the range [first, last). The generator function has to be defined by the user, and it is called successively for assigning the n

std::function in C++

The std::function() in C++ is a function wrapper class which can store and call any function or a callable object. In this article, we will learn about std::function in C++ and how to use it in different cases.Table of ContentWhat is std::function in C++?Example of std::functionMember Functions of s

count() in C++ STL

In C++, the count() is a built-in function used to find the number of occurrences of an element in the given range. This range can be any STL container or an array. In this article, we will learn about the count() function in C++.Letâ€™s take a quick look at a simple example that uses count() method:C

random header in C++ | Set 1(Generators)

This header introduces random number generation facilities. This library allows to produce random numbers using combinations of generators and distributions. Generators: Objects that generate uniformly distributed numbers.Distributions: Objects that transform sequences of numbers generated by a gene

IntStream generate() method in Java

In Java, the IntStream.generate() method is part of the java.util.stream.IntStream class. This method is used to generate an infinite sequential and unordered stream of int values. This method takes IntSupplier as an argument. Note: It is commonly used for generating random numbers, constant streams

std::string::data() in C++

The data() function writes the characters of the string into an array. It returns a pointer to the array, obtained from conversion of string to the array. Its Return type is not a valid C-string as no '\0' character gets appended at the end of array. Syntax: const char* data() const; char* is the po

STD::array in C++

The array is a collection of homogeneous objects and this array container is defined for constant size arrays or (static size). This container wraps around fixed-size arrays and the information of its size are not lost when declared to a pointer. In order to utilize arrays, we need to include the ar

set operator= in C++ STL

The â€˜=â€™ is an operator in C++ STL which copies (or moves) a set to another set and set::operator= is the corresponding operator function. There are three versions of this function: The first version takes reference of an set as an argument and copies it to an set. Syntax: ums1.operator=(set &set

make_pair() in C++ STL

In C++, make_pair() is a standard library function used to construct a key-value pair from the given arguments. The type of the pair constructed is deduced automatically from the type of arguments. In this article, we will learn about make_pair() function in C++.Letâ€™s take a quick look at a simple e

In C++, #define is a preprocessor directive used to define a macro. Macros are a way to represent a fragment of code or a constant value by giving it a name. When the preprocessor encounters the macro name in the code, it replaces it with the corresponding code fragment or value that is defined usin