What's the difference in instantiating variable with vs. without braces in C++?

Question

#include <iostream>
using namespace std;

struct CTest 
{
    CTest() { cout << "Constructor called"; }
    CTest(string s) { cout << "Any constructor with parameters"; } 
};

int main () {
  CTest t1;
  CTest t2{};
}

I come from the Java world and there t1 would just have been declared which definitely isn't the case here since both both lines call the constructor of CTtest. In this case, t1 calls the overwritten default constructor as well as t2. Are there any cases where it actually makes a difference or can we always omit the braces?

Maybe it's just me, but I couldn't find any hint on that. There are only discussions about when to use braces vs. parentheses (vs. value vs. copy constructor).

Answer 1

When the only constructor for a class is its default constructor then doing initialization with curly braces doesn't matter:

CTest t1;
CTest t2{};

Are the same.

Its only once you have other constructors that take parameters that putting values for those parameters inside of {} that you are doing something new.