理解C++中花括号{}的作用

• 前言

  {} 在C++中功能较多，笼统来讲，功能起源是“变量初始化”，其用于汇总函数statements，也可以抽象理解为对函数这个变量的初始化。

• 功能案例

  • Functions

    void myfunction(datatype argument) {
      // any statement(s)
    }
    

  • Loops

    while (boolean expression) {
      // any statement(s)
    }
    
    do {
      // any statement(s)
    } while (boolean expression);
    
    for (initialisation; termination condition; incrementing expr) {
      // any statement(s)
    }
    

  • Conditional Statements

    if (boolean expression) {
      // any statement(s)
    }
    
    else if (boolean expression) {
      // any statement(s)
    }
    else {
      // any statement(s)
    }
    

  • Return {}

    return {} indicates “return an object of the function’s return type initialized with an empty”

  • Initialization

    The initialization of variables was uniformed in C++11. The rule is quite simple. {}-Initialization is always applicable.

• References

1. Reference > En > Language > Structure > Further syntax > Curlybraces
2. What does “return {}” statement mean in C++11?
3. Modernes C++ : {} - Initialization
4. Use of Curly Brackets (Braces) Around a variable C++