Uniform Initialization
Uniform initialization, introduced in C++11, provides a consistent brace {} syntax for initializing variables, arrays, structs, and objects.
main.cpp
123int a {5}; // Initialize 'int' double b {3.14}; // Initialize 'double' char c {'A'}; // Initialize 'char'
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.
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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?
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Uniform initialization, introduced in C++11, provides a consistent brace {} syntax for initializing variables, arrays, structs, and objects.
main.cpp
123int a {5}; // Initialize 'int' double b {3.14}; // Initialize 'double' char c {'A'}; // Initialize 'char'
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.
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