# C++ keyword: decltype (since C++11)

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< cpp‎ | keyword

### Usage

- `decltype` specifier (since C++11)
- `decltype(auto)` (since C++14)

### Notes

Feature-test macro | Value | Std | Comment
--- | --- | --- | ---
`__cpp_decltype` | 200707L | (C++11) | `decltype`
`__cpp_decltype_auto` | 201304L | (C++14) | Return type deduction for normal functions

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