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Static Public Member Functions | List of all members
o2::RangeTokenizer Class Reference

Tokenize a string according to delimiter ',' and extract values of type T. More...

#include <RangeTokenizer.h>

Static Public Member Functions

template<typename T >
static std::vector< T > tokenize (std::string input, std::function< T(std::string const &)> convert=[](std::string const &token) {T value;std::istringstream(token) > > value;return value;})
 
template<typename T , typename std::enable_if_t< std::is_integral< T >::value==true, int > = 0>
static void insertRange (std::vector< T > &res, std::string token, std::function< T(std::string const &)> convert)
 extract a range of an integral type from a token string and add to vector
 

Detailed Description

Tokenize a string according to delimiter ',' and extract values of type T.

Extract a sequence of elements of specified type T from a string argument. Elements are separated by comma. If T is an integral type, also ranges are supported using '-'.

The default conversion from token to type is using std stringstream operator>> which supports a variety of built-in conversions. A custom handler function of type std::function<T(std::string const&)> can be provided to convert string tokens to the specified output type.

Returns
std::vector of type T

Usage: // the simple case using integral type std::vector<int> tokens = RangeTokenizer::tokenize<int>("0-5,10,13");

// simple case using string type std::vector<std::string> tokens = RangeTokenizer::tokenize<std::string>("apple,strawberry,tomato");

// process a custom type according to a map // use a custom mapper function, this evetually throws an exception if the token is not in the map enum struct Food { Apple, Strawberry, Tomato }; const std::map<std::string, Food> FoodMap { { "apple", Food::Apple }, { "strawberry", Food::Strawberry }, { "tomato", Food::Tomato }, }; std::vector<Food> tokens = RangeTokenizer::tokenize<Food>("apple,tomato", [FoodMap](auto const& token) { return FoodMap.at(token); } );

Definition at line 62 of file RangeTokenizer.h.

Member Function Documentation

◆ insertRange()

template<typename T , typename std::enable_if_t< std::is_integral< T >::value==true, int > = 0>
static void o2::RangeTokenizer::insertRange ( std::vector< T > &  res,
std::string  token,
std::function< T(std::string const &)>  convert 
)
inlinestatic

extract a range of an integral type from a token string and add to vector

Definition at line 85 of file RangeTokenizer.h.

◆ tokenize()

template<typename T >
static std::vector< T > o2::RangeTokenizer::tokenize ( std::string  input,
std::function< T(std::string const &)>  convert = [](std::string const& token) {T value; std::istringstream(token) >> value; return value; } 
)
inlinestatic

Definition at line 64 of file RangeTokenizer.h.

The documentation for this class was generated from the following file: