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chore: add result util

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Jan Laupetin
2025-10-10 13:51:22 +01:00
parent cda0c6ee7e
commit 42473a7320
1 changed files with 124 additions and 0 deletions
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src/Utils/Utils/Result.h Normal file
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#pragma once
#include <type_traits>
#include <variant>
using NoResult = std::monostate;
// Can be replaced by std::expected with c++23
template<typename TResult, typename TError> class Result
{
public:
Result(TResult result)
: m_data(std::variant<TResult, TError>(std::in_place_index<0>, std::move(result)))
{
}
static Result Ok(TResult result)
{
return Result(std::in_place_index<0>, std::move(result));
}
static Result Bad(TError error)
{
return Result(std::in_place_index<1>, std::move(error));
}
constexpr operator bool() const noexcept
{
return m_data.index() == 0;
}
constexpr bool has_value() const noexcept
{
return m_data.index() == 0;
}
constexpr std::add_lvalue_reference_t<TResult> value() &
{
return std::get<0, TResult>(m_data);
}
constexpr std::add_const_t<std::add_lvalue_reference_t<TResult>> value() const&
{
return std::get<0, TResult>(m_data);
}
constexpr std::add_rvalue_reference_t<TResult> value() &&
{
return std::move(std::get<0, TResult>(m_data));
}
constexpr std::add_const_t<std::add_rvalue_reference_t<TResult>> value() const&&
{
return std::move(std::get<0, TResult>(m_data));
}
constexpr std::add_lvalue_reference_t<TResult> operator*() &
{
return std::get<0, TResult>(m_data);
}
constexpr std::add_const_t<std::add_lvalue_reference_t<TResult>> operator*() const&
{
return std::get<0, TResult>(m_data);
}
constexpr std::add_rvalue_reference_t<TResult> operator*() &&
{
return std::move(std::get<0, TResult>(m_data));
}
constexpr std::add_const_t<std::add_rvalue_reference_t<TResult>> operator*() const&&
{
return std::move(std::get<0, TResult>(m_data));
}
constexpr std::add_pointer_t<TResult> operator->()
{
return std::get<0, TResult>(m_data);
}
constexpr std::add_const_t<std::add_pointer_t<TResult>> operator->() const
{
return std::get<0, TResult>(m_data);
}
constexpr std::add_lvalue_reference_t<TError> error() &
{
return std::get<1, TError>(m_data);
}
constexpr std::add_const_t<std::add_lvalue_reference_t<TError>> error() const&
{
return std::get<1, TError>(m_data);
}
constexpr std::add_rvalue_reference_t<TError> error() &&
{
return std::move(std::get<1, TError>(m_data));
}
constexpr std::add_const_t<std::add_rvalue_reference_t<TError>> error() const&&
{
return std::move(std::get<1, TError>(m_data));
}
private:
explicit Result(std::variant<TResult, TError> data)
: m_data(std::move(data))
{
}
std::variant<TResult, TError> m_data;
};
#define ENSURE_RESULT_VAR(var) \
if (!(var)) \
return (var);
#define ENSURE_RESULT(expr) \
{ \
const auto result = (expr); \
if (!result) \
return result; \
}