C++ Code Blocks

#include <some_header>
    #include "another_header.hpp"
#   define A_MACRO value
#define stringize(hello) #hello
// No escape
/* No escape */
/* No escape
 * with newlines
 */
// In Header: <boost/optional/optional.hpp>
/* In Header: <boost/optional/optional.hpp> */
/* Multiple escapes: italic
 * underlinebold
 */
/* Token pasting: */ a##b

A badly formed comment:

/* Oh dear

A badly formed comment with an escape:

/* Oh dear bold

Just some code:

int main() {
    constexpr char32_t x = 'a';
    const auto y = x - ' ';
}