打印自定义类型需要特化print_define

#include <fast_io.h>
struct point
{
	int x{};
	int y{};
};

template <typename char_type, typename output>
void print_define(::fast_io::io_reserve_type_t<char_type, point>, output out, point const &p)
{
	if constexpr (::std::is_same_v<char_type, char>)
	{
		::fast_io::println(out, "(", p.x, ",", p.y, ")");
	}
	::fast_io::println("-----------------");
}

int main(){
     ::fast_io::println(point{2, 5});
}

结果

(2,5) -----------------

打印容器

 std::vector vec{1,2,3,4,5};
 fast_io::println(::fast_io::mnp::rgvw(str, ","));

结果

1|2|3|4|5

打印带自定义类的容器

#include <fast_io.h>
struct test_t
{
	constexpr test_t() noexcept
		: content{}
	{}
	constexpr test_t(std::size_t i) noexcept
		: content{i}
	{}
	constexpr test_t(test_t const &other) noexcept
		: content{other.content}
	{}
	constexpr test_t &operator=(test_t const &other) noexcept
	{
		content = other.content;
		return *this;
	}
	constexpr test_t(test_t &&other) noexcept
		: content{other.content}
	{}
	constexpr test_t &operator=(test_t &&other) noexcept
	{
		content = other.content;
		return *this;
	}
	constexpr ~test_t() noexcept
	{}
	std::size_t content;
};

template <typename char_type, typename out_type>
inline constexpr void print_define(fast_io::io_reserve_type_t<char_type, test_t>, out_type out,test_t const &t) noexcept
{
	fast_io::operations::print_freestanding<false>(out, t.content);
}
int main(){
    std::vector v3{test_t{3}, test_t{4}, test_t{5}};
	println("-----");

	v3.insert(v3.begin(), 3);
	println(fast_io::mnp::rgvw(v3, " "));
	println("-----");
}

结果

-----
3 3 4 5
-----