Some H1 italic bold or both

Some H2

Some H3

Some H4

Some H5
main.cpp
#include <iostream>
struct Test
{
public:
float m_thing = 1.0f;
};
namespace thing
{
void my_func()
{
}
}
void main()
{
Test t;
std::cout << "Hello, world!\n";
thing::my_func();
}