编译期重复给定字符串n遍

gen_str.cpp

#include <iostream>
#include <memory>

template <unsigned int Times> struct __attribute__((__packed__)) bracks
{
  char a = '{';
  char b = '}';
  bracks<Times - 1> next;

  constexpr const char* get() const noexcept
  {
    return reinterpret_cast<const char *>(std::addressof(a));
  }
};

template <> struct __attribute__((__packed__)) bracks<0> { char csend = '\0'; };

int main(void)
{
  bracks<8> br;
  const char * s{br.get()};

  std::cout << std::string{s} << std::endl;
  return 0;
}