GitLab

* Missing include for `dlib::loss_multiclass_log_per_pixel_::label_to_ignore`

I was trying to compile the examples and encountered this issue after moving `rgb_label_image_to_index_label_image` to cpp file. Headers should include all symbols they mention.

* Update pascal_voc_2012.h

Should use the official entrypoint for including dnn stuff.
Co-authored-by: Davis E. King <davis685@gmail.com>

* add more cuda capabilities

* Allow setting custom cuda capabilities

* improve default behavior

* rename to compute capabilities

* add progress information (current/total and percent)

* print a new line instead of overwritting with spaces

* check if target_val is an integer with std::trunc

* add function to compute string dimensions in pixels

* use custom struct as a return value, remove first and last params

* Update dlib/image_transforms/draw_abstract.h
Co-authored-by: Davis E. King <davis@dlib.net>

* Fix cannot compile iso only code (#579)

also fixing (#1742)

* Remove GUI dependency from fonts (#2273)

* Fix disable_duplicative_biases when the input is a skip layer

* fix template parameters

* try to make sure travis uses C++17

* fix unbound variable

* Update dlib/travis/build-and-test.sh
Co-authored-by: Davis E. King <davis@dlib.net>

* Fix serialize variant with C++17

* fix order of parameters

* added support for std::optional if using C++

* oops, bug fix + check if item already holds a type

* oops, another bug fix

* remove warnings about unused parameters
Co-authored-by: pf <pf@me>

* [SERIALIZATION] addes support for std::variant

* [SERIALIZATION] bug fix + added tests

* support immutable types

* put an immutable type in std::variant
Co-authored-by: pf <pf@me>

Do this by just making all layers have a .input_layer() method, which in
that context can be implemented in a simple manner.

Also fix this error from cmake 3.5.1:

```
CMake Error at CMakeLists.txt:62 (if):
  if given arguments:

    "CMAKE_COMPILER_IS_GNUCXX" "AND" "CMAKE_CXX_COMPILER_VERSION" "VERSION_LESS_EQUAL" "4.8.5"

  Unknown arguments specified
```

* do not attempt to build with gcc 4.8.5 or older

* add comment

* [TYPE_SAFE_UNION] use std::aligned_union instead of stack_based_memory_block. std::aligned_union was specifically designed to do this kind of stuff and we are better off trusting the standard library deciding what the correct storage type should be and what the appropriate alignment should be

* [TYPE_SAFE_UNION] as per Davis' suggestion, std::aligned_union can take Len parameter 0. Also, the content's of validate_type() has been bugging me for ages, so i created is_any which is based on std::is_same. I've also replaced is_same_type with std::is_same
Co-authored-by: Peter Featherstone <peter@grampus-server.com>