A C++ template library for embedded applications
MIT licensed
Designed and
maintained by
John Wellbelove
No

STL


It is possible to use the ETL without any reliance on the STL.
This can be achieved by defining the project wide macro ETL_NO_STL

When this macro is defined then the ETL will used its own reverse engineered versions of traits and algorithms.
These traits and algorithms are available to the user of the ETL, regardless of whether the STL is used or not.

When the STL is used, then, for the most part, the ETL will merely act as a wrapper around the STL definitions.
For STL/ETL compatibility, some algorithms and classes in the ETL will use/return either 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.
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.

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.

Using pair, move, iterator tags or reverse_iterator + others

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 :-
pair
make_pair
reverse_iterator
input_iterator_tag
output_iterator_tag
forward_iterator_tag
bidirectional_iterator_tag
random_access_iterator_tag
begin
cbegin
rbegin
crbegin
end
cend
rend
crend
size
swap

Note
The ETL is not intended to be a complete clone of the STL.
The ETL's version of STL features is not exhaustive, and many features are missing.

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.