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75 lines
2.4 KiB
C++
75 lines
2.4 KiB
C++
/**
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* @file result_utilities.h
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* @brief Utilities for handling Results.
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* @author SciresM
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* @copyright libnx Authors
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*/
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#pragma once
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#include <switch/result.h>
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#ifdef __cplusplus
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extern "C" {
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#endif
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/// Evaluates an expression that returns a result, and returns the result if it would fail.
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#define R_TRY(res_expr) \
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do { \
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const Result _tmp_r_try_rc = res_expr; \
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if (R_FAILED(_tmp_r_try_rc)) { \
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return _tmp_r_try_rc; \
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} \
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} while (0)
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/// Helpers for pattern-matching on a result expression, if the result would fail.
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#define R_TRY_CATCH(res_expr) \
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do { \
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const Result _tmp_r_try_catch_rc = res_expr; \
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if (R_FAILED(_tmp_r_try_catch_rc)) { \
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if (false)
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#define R_CATCH(catch_result) \
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} else if (_tmp_r_try_catch_rc == catch_result) { \
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_Static_assert(R_FAILED(catch_result), "Catch result must be constexpr error Result!"); \
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if (false) { } \
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else
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#define R_CATCH_RANGE(catch_result_start, catch_result_end) \
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} else if (catch_result_start <= _tmp_r_try_catch_rc && _tmp_r_try_catch_rc <= catch_result_end) { \
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_Static_assert(R_FAILED(catch_result_start), "Catch start result must be constexpr error Result!"); \
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_Static_assert(R_FAILED(catch_result_end), "Catch end result must be constexpr error Result!"); \
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_Static_assert(R_MODULE(catch_result_start) == R_MODULE(catch_result_end), "Catch range modules must be equal!"); \
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if (false) { } \
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else
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#define R_CATCH_MODULE(module) \
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} else if (R_MODULE(_tmp_r_try_catch_rc) == module) { \
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_Static_assert(module != 0, "Catch module must be error!"); \
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if (false) { } \
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else
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#define R_END_TRY_CATCH \
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} else if (R_FAILED(_tmp_r_try_catch_rc)) { \
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return _tmp_r_try_catch_rc; \
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} \
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} while (0)
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#ifdef __cplusplus
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}
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#endif
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// For C++, also define R_CATCH_MANY helper.
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#ifdef __cplusplus
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template<Result... rs>
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constexpr inline bool _CheckResultsForMultiTryCatch(const Result &rc) {
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static_assert((R_FAILED(rs) && ...), "Multi try catch result must be constexpr error Result!");
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return ((rs == rc) || ...);
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}
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#define R_CATCH_MANY(...) \
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} else if (_CheckResultsForMultiTryCatch<__VA_ARGS__>(_tmp_r_try_catch_rc)) { \
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if (false) { } \
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else
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#endif
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