blog/static/files/cpp/exceptions-and-raii/placeholders/placeholders.hpp

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#include <exception>
#include <format>
#include <string>
class _todo : public std::exception {
std::string cause;
public:
_todo() : cause("not yet implemented") {}
_todo(std::string&& excuse) : cause("not yet implemented: " + excuse) {}
virtual const char* what() const throw() { return cause.c_str(); }
};
/**
* @brief Indicates unfinished code.
*/
void todo() { throw _todo(); }
/**
* @brief Indicates unfinished code.
* @param fmt an object that represents the format string
* @param args arguments to be formatted
*/
template <class... Args>
void todo(std::format_string<Args...> fmt, Args&&... args) {
throw _todo(std::format(fmt, args...));
}
class _unimplemented : public std::exception {
std::string cause;
public:
_unimplemented() : cause("not implemented") {}
_unimplemented(std::string&& excuse)
: cause("not implemented: " + excuse) {}
virtual const char* what() const throw() { return cause.c_str(); }
};
/**
* @brief Indicates unimplemented code by throwing with a message of not implemented.
*/
void unimplemented() { throw _unimplemented(); }
/**
* @brief Indicates unimplemented code by throwing with a message of not implemented.
* @param fmt an object that represents the format string
* @param args arguments to be formatted
*/
template <class... Args>
void unimplemented(std::format_string<Args...> fmt, Args&&... args) {
throw _unimplemented(std::format(fmt, args...));
}
class _unreachable : public std::exception {
std::string cause;
public:
_unreachable() : cause("entered unreachable code") {}
_unreachable(std::string&& excuse)
: cause("entered unreachable code: " + excuse) {}
virtual const char* what() const throw() { return cause.c_str(); }
};
/**
* @brief Indicates unreachable code.
*/
void unreachable() { throw _unreachable(); }
/**
* @brief Indicates unreachable code.
* @param fmt an object that represents the format string
* @param args arguments to be formatted
*/
template <class... Args>
void unreachable(std::format_string<Args...> fmt, Args&&... args) {
throw _unreachable(std::format(fmt, args...));
}