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196 lines
2.7 KiB
Markdown
196 lines
2.7 KiB
Markdown
---
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title: "result"
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---
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{{< callout type="info">}}
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Header: `result.h`
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From: `20.17.0`
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Similar to: `std::expected`
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{{< /callout >}}
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{{< callout type="warning">}}
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**This class is deprecated.**
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Use `etl::expected` as a replacement.
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{{< /callout >}}
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A generic result type for returning either a result or an error.
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Deprecated. Use etl::expected
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## result
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```cpp
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template <typename TValue, typename TError>
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class result
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```
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---
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```cpp
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template <typename TError>
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class result<void, TError>
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```
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**Description**
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Specialisation for `void` `result`.
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---
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```c++
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result() = delete;
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```
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**Description**
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Cannot be default constructed.
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---
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```cpp
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result(const result& other)
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```
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**Description**
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Copy constructor.
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---
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```cpp
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result(result&& other)
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```
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**Description**
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Move constructor.
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---
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```cpp
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result(const TValue& value)
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```
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**Description**
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Construct from a value.
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Not valid for void specialisation.
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---
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```cpp
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result(TValue&& value)
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```
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**Description**
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Move construct from a value.
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Not valid for void specialisation.
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---
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```cpp
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result(const TError& err)
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```
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**Description**
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Construct from error.
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---
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```cpp
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result(TError&& err)
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```
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**Description**
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Move construct from error.
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---
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```cpp
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result& operator =(const result& other)
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```
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**Description**
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Copy assign.
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---
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```cpp
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result& operator =(result&& other)
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```
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**Description**
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Move assign.
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---
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```cpp
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result& operator =(const TValue& value)
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```
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**Description**
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Copy assign from value.
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Not valid for void specialisation.
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---
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```cpp
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result& operator =(TValue&& value)
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```
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**Description**
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Move assign from value.
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Not valid for void specialisation.
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---
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```cpp
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result& operator =(const TError& err)
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```
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**Description**
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Copy assign from error.
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---
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```cpp
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result& operator =(TError&& err)
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```
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**Description**
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Move assign from error.
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---
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```cpp
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bool is_value() const
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```
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**Description**
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`true` if result contains a value.
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---
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```cpp
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bool is_error() const
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```
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**Description**
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`true` if result contains an error.
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---
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```cpp
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const TValue& value() const
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```
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**Description**
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Returns a const reference to the value.
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Undefined if the result does not contain an value.
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Not valid for void specialisation.
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---
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```cpp
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TValue&& value()
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```
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**Description**
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Returns an rvalue reference to the value.
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Undefined if the result does not contain an value.
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Not valid for void specialisation.
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---
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```cpp
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const TError& error() const
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```
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**Description**
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Returns a const reference to the error.
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Undefined if the result does not contain an error.
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---
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```cpp
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TError&& error()
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```
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**Description**
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Returns an rvalue reference to the error.
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Undefined if the result does not contain an error.
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