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CommandLineParser: add special <none> value to disallow empty strings

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some mandatory string keys like paths must not be empty. Add the special
default value `<none>` so the CommandLineParser can enforce this and
generate an according error message for us.
This commit is contained in:
Pavel Rojtberg
2015-09-23 12:03:44 +02:00
parent a388806555
commit 1dd7f546af
3 changed files with 47 additions and 23 deletions
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5
modules/core/include/opencv2/core/utility.hpp
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@@ -609,7 +609,7 @@ For example:
const String keys =
"{help h usage ? | | print this message }"
"{@image1 | | image1 for compare }"
"{@image2 | | image2 for compare }"
"{@image2 |<none>| image2 for compare }"
"{@repeat |1 | number }"
"{path |. | path to file }"
"{fps | -1.0 | fps for output video }"
@@ -623,6 +623,9 @@ Note that there are no default values for `help` and `timestamp` so we can check
Arguments with default values are considered to be always present. Use the `get()` method in these cases to check their
actual value instead.
String keys like `get<String>("@image1")` return the empty string `""` by default - even with an empty default value.
Use the special `<none>` default value to enforce that the returned string must not be empty. (like in `get<String>("@image2")`)
### Usage
For the described keys: