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copied!<p>For the first part, this should work</p> <pre><code>namespace po = boost::program_options; po::option_descriptions desc(""); desc.add_options() ("opt", po::value<std::vector<int> >()->multitoken(), "description"); </code></pre> <p>The second part, requires a bit more work. The function <a href="http://www.boost.org/doc/libs/1_48_0/doc/html/program_options/reference.html#header.boost.program_options.value_semantic_hpp"><code>po::value</code></a> returns a <code>po::typed_value< T, charT ></code> on which you'll have to override the behavior of several functions, as follows</p> <pre><code>template< typename T, typename charT = char > class fixed_tokens_typed_value : public po::typed_value< T, charT > { unsigned _min, _max; typedef po::typed_value< T, charT > base; public: fixed_tokens_typed_value( T * t, unsigned min, unsigned max ) : _min(min), _max(max), base( t ) { base::multitoken(); } virtual multi_typed_value* min_tokens( unsigned min ) { _min = min; return *this; } unsigned min_tokens() const {return _min;} virtual multi_typed_value* max_tokens( unsigned max ) { _max = max; return *this; } unsigned max_tokens() const {return _max;} base* zero_tokens() { _min = _max = 0; base::zero_tokens(); return *this; } } </code></pre> <p>which needs to be accompanied by </p> <pre><code>template< typename T > fixed_tokens_typed_value< T > fixed_tokens_value(unsigned min, unsigned max) { return fixed_tokens_typed_value< T >(0, min, max ); } template< typename T > fixed_tokens_typed_value< T > fixed_tokens_value(T * t, unsigned min, unsigned max) { fixed_tokens_typed_value< T >* r = new fixed_tokens_typed_value< T >(t, min, max); return r; } </code></pre> <p>Then </p> <pre><code>desc.add_options() ("opt", po::fixed_tokens_value<std::vector<int> >(2,2), "description"); </code></pre> <p>should work. I have not yet had a chance to test it, so it likely contains a few bugs. But, at a minimum, should give you an idea of what you need.</p>

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