Notice: This page requires JavaScript to function properly.
Please enable JavaScript in your browser settings or update your browser.Lära Uniform Initialization | Type Inference and Initialization
C++ Modern Features

bookUniform Initialization

Uniform initialization, introduced in C++11, provides a consistent brace {} syntax for initializing variables, arrays, structs, and objects.

main.cpp

main.cpp

copy

              
123

            
int a {5};        // Initialize 'int'
double b {3.14};  // Initialize 'double'
char c {'A'};     // Initialize 'char'
Note
Note

Using braces {} avoids accidental narrowing conversions. For example, int a{3.5}; would cause a compile-time error.

Uniform initialization works consistently for both built-in and standard containers.

main.cpp

main.cpp

copy

              
12345678910

            
#include <array>
#include <iostream>

int main()
{
    int numbers[] {1, 2, 3, 4};             // Built-in array
    std::array<int, 3> arr {10, 20, 30};    // `std::array`

    std::cout << numbers[3] << ", " << arr[2] << std::endl;
}

You can initialize structs and classes directly using braces.

main.cpp

main.cpp

copy

              
123456789101112

            
#include <iostream>

struct Point {
    int x;
    int y;
};

int main()
{
    Point p1 {7, 9};   // Uniform initialization for `struct`
    std::cout << "(" << p1.x << ", " << p1.y << ")" << std::endl;
}

Uniform initialization gives a single, safe way to initialize any object using braces { }, reducing ambiguity and preventing narrowing errors.

question mark

What is one benefit of using uniform initialization {}?

Select the correct answer

Var allt tydligt?

Hur kan vi förbättra det?

Tack för dina kommentarer!

Avsnitt 1. Kapitel 2

Fråga AI

expand

Fråga AI

ChatGPT

Fråga vad du vill eller prova någon av de föreslagna frågorna för att starta vårt samtal

Suggested prompts:

Can you give examples of uniform initialization in C++?

What are narrowing errors and how does uniform initialization prevent them?

Are there any limitations or drawbacks to using uniform initialization?

Awesome!

Completion rate improved to 14.29

bookUniform Initialization

Svep för att visa menyn

Uniform initialization, introduced in C++11, provides a consistent brace {} syntax for initializing variables, arrays, structs, and objects.

main.cpp

main.cpp

copy

              
123

            
int a {5};        // Initialize 'int'
double b {3.14};  // Initialize 'double'
char c {'A'};     // Initialize 'char'
Note
Note

Using braces {} avoids accidental narrowing conversions. For example, int a{3.5}; would cause a compile-time error.

Uniform initialization works consistently for both built-in and standard containers.

main.cpp

main.cpp

copy

              
12345678910

            
#include <array>
#include <iostream>

int main()
{
    int numbers[] {1, 2, 3, 4};             // Built-in array
    std::array<int, 3> arr {10, 20, 30};    // `std::array`

    std::cout << numbers[3] << ", " << arr[2] << std::endl;
}

You can initialize structs and classes directly using braces.

main.cpp

main.cpp

copy

              
123456789101112

            
#include <iostream>

struct Point {
    int x;
    int y;
};

int main()
{
    Point p1 {7, 9};   // Uniform initialization for `struct`
    std::cout << "(" << p1.x << ", " << p1.y << ")" << std::endl;
}

Uniform initialization gives a single, safe way to initialize any object using braces { }, reducing ambiguity and preventing narrowing errors.

question mark

What is one benefit of using uniform initialization {}?

Select the correct answer

Var allt tydligt?

Hur kan vi förbättra det?

Tack för dina kommentarer!

Avsnitt 1. Kapitel 2
some-alt