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@@ -89,3 +89,4 @@ web/locale.* | |
| web/secondlife.com.* | ||
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| .env | ||
| .vscode | ||
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| /** | ||
| * @file always_return.h | ||
| * @author Nat Goodspeed | ||
| * @date 2023-01-20 | ||
| * @brief Call specified callable with arbitrary arguments, but always return | ||
| * specified type. | ||
| * | ||
| * $LicenseInfo:firstyear=2023&license=viewerlgpl$ | ||
| * Copyright (c) 2023, Linden Research, Inc. | ||
| * $/LicenseInfo$ | ||
| */ | ||
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| #if ! defined(LL_ALWAYS_RETURN_H) | ||
| #define LL_ALWAYS_RETURN_H | ||
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| #include <type_traits> // std::enable_if, std::is_convertible | ||
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| namespace LL | ||
| { | ||
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| #if __cpp_lib_is_invocable >= 201703L // C++17 | ||
| template <typename CALLABLE, typename... ARGS> | ||
| using invoke_result = std::invoke_result<CALLABLE, ARGS...>; | ||
| #else // C++14 | ||
| template <typename CALLABLE, typename... ARGS> | ||
| using invoke_result = std::result_of<CALLABLE(ARGS...)>; | ||
| #endif // C++14 | ||
|
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| /** | ||
| * AlwaysReturn<T>()(some_function, some_args...) calls | ||
| * some_function(some_args...). It is guaranteed to return a value of type | ||
| * T, regardless of the return type of some_function(). If some_function() | ||
| * returns a type convertible to T, it will convert and return that value. | ||
| * Otherwise (notably if some_function() is void), AlwaysReturn returns | ||
| * T(). | ||
| * | ||
| * When some_function() returns a type not convertible to T, if | ||
| * you want AlwaysReturn to return some T value other than | ||
| * default-constructed T(), pass that value to AlwaysReturn's constructor. | ||
| */ | ||
| template <typename DESIRED> | ||
| class AlwaysReturn | ||
| { | ||
| public: | ||
| /// pass explicit default value if other than default-constructed type | ||
| AlwaysReturn(const DESIRED& dft=DESIRED()): mDefault(dft) {} | ||
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| // callable returns a type not convertible to DESIRED, return default | ||
| template <typename CALLABLE, typename... ARGS, | ||
| typename std::enable_if< | ||
| ! std::is_convertible< | ||
| typename invoke_result<CALLABLE, ARGS...>::type, | ||
| DESIRED | ||
| >::value, | ||
| bool | ||
| >::type=true> | ||
| DESIRED operator()(CALLABLE&& callable, ARGS&&... args) | ||
| { | ||
| // discard whatever callable(args) returns | ||
| std::forward<CALLABLE>(callable)(std::forward<ARGS>(args)...); | ||
| return mDefault; | ||
| } | ||
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| // callable returns a type convertible to DESIRED | ||
| template <typename CALLABLE, typename... ARGS, | ||
| typename std::enable_if< | ||
| std::is_convertible< | ||
| typename invoke_result<CALLABLE, ARGS...>::type, | ||
| DESIRED | ||
| >::value, | ||
| bool | ||
| >::type=true> | ||
| DESIRED operator()(CALLABLE&& callable, ARGS&&... args) | ||
| { | ||
| return { std::forward<CALLABLE>(callable)(std::forward<ARGS>(args)...) }; | ||
| } | ||
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| private: | ||
| DESIRED mDefault; | ||
| }; | ||
|
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| /** | ||
| * always_return<T>(some_function, some_args...) calls | ||
| * some_function(some_args...). It is guaranteed to return a value of type | ||
| * T, regardless of the return type of some_function(). If some_function() | ||
| * returns a type convertible to T, it will convert and return that value. | ||
| * Otherwise (notably if some_function() is void), always_return() returns | ||
| * T(). | ||
| */ | ||
| template <typename DESIRED, typename CALLABLE, typename... ARGS> | ||
| DESIRED always_return(CALLABLE&& callable, ARGS&&... args) | ||
| { | ||
| return AlwaysReturn<DESIRED>()(std::forward<CALLABLE>(callable), | ||
| std::forward<ARGS>(args)...); | ||
| } | ||
|
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| /** | ||
| * make_always_return<T>(some_function) returns a callable which, when | ||
| * called with appropriate some_function() arguments, always returns a | ||
| * value of type T, regardless of the return type of some_function(). If | ||
| * some_function() returns a type convertible to T, the returned callable | ||
| * will convert and return that value. Otherwise (notably if | ||
| * some_function() is void), the returned callable returns T(). | ||
| * | ||
| * When some_function() returns a type not convertible to T, if | ||
| * you want the returned callable to return some T value other than | ||
| * default-constructed T(), pass that value to make_always_return() as its | ||
| * optional second argument. | ||
| */ | ||
| template <typename DESIRED, typename CALLABLE> | ||
| auto make_always_return(CALLABLE&& callable, const DESIRED& dft=DESIRED()) | ||
| { | ||
| return | ||
| [dft, callable = std::forward<CALLABLE>(callable)] | ||
| (auto&&... args) | ||
| { | ||
| return AlwaysReturn<DESIRED>(dft)(callable, | ||
| std::forward<decltype(args)>(args)...); | ||
| }; | ||
| } | ||
|
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| } // namespace LL | ||
|
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| #endif /* ! defined(LL_ALWAYS_RETURN_H) */ |
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