Fixes to cpp-optparse

[benoit-leveau]

Default values for options can be set either with a string or another type because Option::set_default() has a templated version. OptionParser::set_defaults() only had a string version, so I added a templated one as well so we can do:

OptionParser parser = OptionParser();
parser.add_option("--option1").action("store").type("int").set_default("1");
parser.add_option("--option2").action("store").type("int").set_default(1);
parser.set_defaults("options1", "640");
parser.set_defaults("option2", 640); // now works

Default values for options inside an OptionGroup were not previously working:

OptionParser parser = OptionParser();
OptionGroup group = OptionGroup(parser, "Size Options", "Image Size Options.");
group.add_option("-w", "--width").action("store").type("int").set_default(640).help("default: %default");
group.add_option("-h", "--height").action("store").type("int").help("default: %default");
group.set_defaults("height", 480);
parser.add_option_group(group);

Values& parse_options = parser.parse_args(argc, argv);
std::cout << "width: " << int(parse_options.get("width")) << std::endl;
std::cout << "height: " << int(parse_options.get("height")) << std::endl;

would print:

width: 0
height: 0

When looking for default values, we now browse the OptionGroup list and look for default values in the options and at the OptionGroup level.
It now correctly prints:

width: 640
height: 480

[weisslj]

Thanks!

[alonsojr1980]

Friends, I'm having trouble using OptionParser.h in a VS Community 2013 project. The compile error is:

Error 1 error LNK2019: unresolved external symbol "public: __cdecl optparse::OptionParser::OptionParser(void)" (??0OptionParser@optparse@@qeaa@XZ) referenced in function main D:\AREA_TRABALHO_CGM\SISTEMAS\CGM_IMAGE_TOOLS\CgmImageTools\main.obj CgmImageTools

Any tips? Thanks!

[benoit-leveau]

The error you're getting basically means that your project can't find the
actual code of OptionParser. You've probably only added the header through
an include, but not the cpp file.

So, you either need to:

1. add OptionParser.cpp to your project as well
   or
2. link your project with a OptionParser library that you would compile in
   a separate project (this project would contain only OptionParser.cpp/.h)

Option 1 will be easier and is just a matter of adding the file to your
visual studio project.

On Mon, Jul 13, 2015 at 8:45 PM, alonsojr1980 notifications@github.com
wrote:

Friends, I'm having trouble using OptionParser.h in a VS Community 2013
project. The compile error is:

Error 1 error LNK2019: unresolved external symbol "public: __cdecl
optparse::OptionParser::OptionParser(void)" (??0OptionParser@optparse
@@qeaa@XZ) referenced in function main
D:\AREA_TRABALHO_CGM\SISTEMAS\CGM_IMAGE_TOOLS\CgmImageTools\main.obj
CgmImageTools

Any tips? Thanks!

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[alonsojr1980]

Thank you! I'm new to c++ and appreciate your help.