v8
10.1.124 (node 18.2.0)
V8 is Google's open source JavaScript engine
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#include <v8-maybe.h>
Public Member Functions | |
V8_INLINE bool | IsNothing () const |
V8_INLINE bool | IsJust () const |
V8_INLINE T | ToChecked () const |
V8_INLINE void | Check () const |
V8_WARN_UNUSED_RESULT V8_INLINE bool | To (T *out) const |
V8_INLINE T | FromJust () const |
V8_INLINE T | FromMaybe (const T &default_value) const |
V8_INLINE bool | operator== (const Maybe &other) const |
V8_INLINE bool | operator!= (const Maybe &other) const |
Friends | |
template<class U > | |
Maybe< U > | Nothing () |
template<class U > | |
Maybe< U > | Just (const U &u) |
A simple Maybe type, representing an object which may or may not have a value, see https://hackage.haskell.org/package/base/docs/Data-Maybe.html.
If an API method returns a Maybe<>, the API method can potentially fail either because an exception is thrown, or because an exception is pending, e.g. because a previous API call threw an exception that hasn't been caught yet, or because a TerminateExecution exception was thrown. In that case, a "Nothing" value is returned.
Definition at line 29 of file v8-maybe.h.
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Short-hand for ToChecked(), which doesn't return a value. To be used, where the actual value of the Maybe is not needed like Object::Set.
Definition at line 43 of file v8-maybe.h.
References v8::api_internal::FromJustIsNothing(), and Maybe< T >::IsJust().
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Converts this Maybe<> to a value of type T. If this Maybe<> is nothing (empty), V8 will crash the process.
Definition at line 60 of file v8-maybe.h.
References v8::api_internal::FromJustIsNothing(), and Maybe< T >::IsJust().
Referenced by Maybe< T >::operator==(), and Maybe< T >::ToChecked().
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Converts this Maybe<> to a value of type T, using a default value if this Maybe<> is nothing (empty).
Definition at line 69 of file v8-maybe.h.
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inline |
Definition at line 32 of file v8-maybe.h.
Referenced by Maybe< T >::Check(), Maybe< T >::FromJust(), Maybe< T >::operator==(), and Maybe< T >::To().
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inline |
Definition at line 31 of file v8-maybe.h.
Definition at line 78 of file v8-maybe.h.
References Maybe< T >::operator==().
Definition at line 73 of file v8-maybe.h.
References Maybe< T >::FromJust(), and Maybe< T >::IsJust().
Referenced by Maybe< T >::operator!=().
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inline |
Converts this Maybe<> to a value of type T. If this Maybe<> is nothing (empty), |false| is returned and |out| is left untouched.
Definition at line 51 of file v8-maybe.h.
References Maybe< T >::IsJust().
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inline |
An alias for |FromJust|. Will crash if the Maybe<> is nothing.
Definition at line 37 of file v8-maybe.h.
References Maybe< T >::FromJust().
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friend |
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friend |
Definition at line 96 of file v8-maybe.h.