Вивчайте Uniform Initialization | Type Inference and Initialization

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

main.cpp


              123
            
int a {5};        // Initialize 'int'
double b {3.14};  // Initialize 'double'
char c {'A'};     // Initialize 'char'

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


              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


              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.

Все було зрозуміло?

Дякуємо за ваш відгук!

Секція 1. Розділ 2

Запитати АІ

Запитайте про що завгодно або спробуйте одне із запропонованих запитань, щоб почати наш чат

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

Свайпніть щоб показати меню

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

main.cpp


              123
            
int a {5};        // Initialize 'int'
double b {3.14};  // Initialize 'double'
char c {'A'};     // Initialize 'char'

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


              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


              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.

Все було зрозуміло?

Дякуємо за ваш відгук!

Секція 1. Розділ 2