Header File lex/whitespace_token.hpp

The file whitespace_token.hpp defines the whitespace token.

namespace lex
{
    struct whitespace_token {};
    
    // traits
    template <class Token>
    struct is_whitespace_token;
}

A token that inherits from lex::whitespace_token in addition to one of the other base classes is a whitespace token. When tokenizing, whitespace tokens will be automatically skipped and not created.

Traits

The traits all derive from either std::true_type or std::false_type, depending on the result of the condition.

is_whitespace_token<Token>: whether or not Token is a whitespace token.