47 lines
1.4 KiB
C++
47 lines
1.4 KiB
C++
#ifndef BWIDGETS_ERROR_HELPER_HPP
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#define BWIDGETS_ERROR_HELPER_HPP
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#include <functional>
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#include <basic_widgets/core/type/sdl_error.hpp>
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extern "C" {
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auto SDL_GetError() -> const char*;
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}
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namespace bwidgets
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{
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// Throw a E exception with message w if ptr is null. Otherwise return ptr.
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template<Exception E, typename T>
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inline auto ptr_or_throw(T* const ptr, const std::string_view w = "unknown") -> T*
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{
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std::string what;
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if constexpr (std::is_same_v<E, SDLError>)
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what = w == "unknown" ? SDL_GetError() : w;
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else what = w;
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if (ptr == nullptr) throw E(what);
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return ptr;
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}
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// Check a return code with the success function passed. If success return false
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// throw an E Exception with message w.
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template<Exception E, typename T>
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inline auto success_or_throw(
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const T code, const std::string_view w = "unknown",
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const std::function<bool(T)>& success = [](T code) { return code == 0; }) -> T
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{
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// If exception type is SDLError and no value or unknown was passed for w, get
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// the last error message using SDL facilities.
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if constexpr (std::is_same_v<E, SDLError>) {
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const std::string what {w == "unknown" ? SDL_GetError() : w};
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if (code < 0) throw E(what);
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}
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else if (success(code)) throw E(w);
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return code;
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}
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}
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#endif
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