Created
June 11, 2024 07:12
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#include <string_view> | |
#include <memory> | |
#include <utility> | |
class life_string_view { | |
std::string_view _data; | |
std::shared_ptr<void> _life; | |
public: | |
life_string_view(std::string_view sv) | |
: _data{sv}, _life{} {} | |
life_string_view(std::string_view sv, std::shared_ptr<void> life) | |
: _data{sv}, _life{life} {} | |
template <class T> | |
static life_string_view allocate(T&& data) { | |
auto p = std::make_shared<T>(std::forward<T>(data)); | |
return {*p, p}; | |
} | |
life_string_view substr(std::size_t start, std::size_t size) { | |
return {_data.substr(start, size), _life}; | |
} | |
friend std::ostream& operator<<(std::ostream& os, life_string_view sv) { | |
return os << sv._data; | |
} | |
}; | |
#include <iostream> | |
life_string_view f(life_string_view sv) | |
{ | |
return sv.substr(1, 3); | |
} | |
life_string_view g() { | |
std::string s = "Hello"; | |
return f(life_string_view::allocate(std::move(s))); | |
} | |
int main() { | |
auto sv = g(); | |
std::cout << sv << std::endl; | |
} |
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