What's the purpose of using braces (i.e. {}) for a single-line if or loop?

Question

I\'m reading some lecture notes of my C++ lecturer and he wrote the following:

1. Use Indentation // OK
2. Never rely on operator preced

Answer 1

I am using {} everywhere except a few cases where it's obvious. Single line is one of the cases:

if(condition) return; // OK

if(condition) // 
   return;    // and this is not a one-liner 

It may hurt you when you add some method before return. Indentation indicates that return is executing when condition is met, but it will return always.

Other example in C# with using statment

using (D d = new D())  // OK
using (C c = new C(d))
{
    c.UseLimitedResource();
}

which is equivalent to

using (D d = new D())
{
    using (C c = new C(d))
    {
        c.UseLimitedResource();
    }
}