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47 lines
2.1 KiB
Markdown
47 lines
2.1 KiB
Markdown
---
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title: "No STL"
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weight: 2
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---
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It is possible to use the ETL without any reliance on the STL —
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This can be achieved by defining the project wide macro `ETL_NO_STL`.
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When this macro is defined then the ETL will used its own reverse engineered versions of traits and algorithms.
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These traits and algorithms are available to the user of the ETL, regardless of whether the STL is used or not.
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When the STL is used, then, for the most part, the ETL will merely act as a wrapper around the STL definitions.
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For STL/ETL compatibility, some algorithms and classes in the ETL will use an STL or ETL defined version of a class. For example, if you are using the STL then a function using or returning a pair will use a std::pair.On the other hand, when `ETL_NO_STL` is defined, an `etl::pair` is used.
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If you wish your code to be able to compiler both with and without the STL, then you would use the `ETL_OR_STD` namespace macro, which resolves to either `std` or `etl`.
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If the C++ level of your compiler does not support a particular algorithm (e.g. C++03 compiler and `std::sorted_until`), then the ETL will revert to its own version.
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## Using pair, move, iterator tags or reverse_iterator + others
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When `ETL_NO_STL` is defined then the ETL will use its own versions, otherwise the STL versions will be used. This will affect the return types of certain functions.e.g. `etl::equal_range` will return `ETL_OR_STD::pair` which resolves to either `std::pair` or `etl::pair` ETL types and functions which are not defined in the ETL namespace when the STL is in use :-
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`pair`
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`make_pair`
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`reverse_iterator`
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`input_iterator_tag`
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`output_iterator_tag`
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`forward_iterator_tag`
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`bidirectional_iterator_tag`
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`random_access_iterator_tag`
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`begin`
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`cbegin`
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`rbegin`
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`crbegin`
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`end`
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`cend`
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`rend`
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`crend`
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`size`
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`swap`
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## Note
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The ETL is not intended to be a complete clone of the STL.
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The ETL's version of STL features is not exhaustive, and many features are missing.
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That said, if there is an STL feature missing from the No STL option, then feel free to add it yourself and generate a pull request.
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