Boost
C++ Libraries
...one of the most highly
regarded and expertly designed C++ library projects in the
world.
— Herb Sutter and Andrei
Alexandrescu, C++
Coding Standards
Boost
C++ Libraries
...one of the most highly
regarded and expertly designed C++ library projects in the
world.
— Herb Sutter and Andrei
Alexandrescu, C++
Coding Standards
boost::program_options::untyped_value
// In header: <boost/program_options/value_semantic.hpp> class untyped_value : public boost::program_options::value_semantic_codecvt_helper< char > { public: // construct/copy/destruct untyped_value(bool = false); // public member functions std::string name() const; unsigned min_tokens() const; unsigned max_tokens() const; bool is_composing() const; bool is_required() const; void xparse(boost::any &, const std::vector< std::string > &) const; bool apply_default(boost::any &) const; void notify(const boost::any &) const; };
Class which specifies a simple handling of a value: the value will have string type and only one token is allowed.
untyped_value public member functionsstd::string name() const;
Returns the name of the option. The name is only meaningful for automatic help message.
unsigned min_tokens() const;
The minimum number of tokens for this option that should be present on the command line.
unsigned max_tokens() const;
The maximum number of tokens for this option that should be present on the command line.
bool is_composing() const;
Returns true if values from different sources should be composed. Otherwise, value from the first source is used and values from other sources are discarded.
bool is_required() const;
Returns true if value must be given. Non-optional value
void xparse(boost::any & value_store, const std::vector< std::string > & new_tokens) const;
If 'value_store' is already initialized, or new_tokens has more than one elements, throws. Otherwise, assigns the first string from 'new_tokens' to 'value_store', without any modifications.
bool apply_default(boost::any &) const;
Does nothing.
void notify(const boost::any &) const;
Does nothing.