CI_Traits - DryPerspective/C_Builder_Extras GitHub Wiki

A traits class to use with stringlike objects in which comparison is made in a case-insensitive manner. This is a C++ tool as old as time, but having a formal implementation stored away never hurts. Class dp::ci_traits<T> is the class to use as a template parameter in classes such as std::basic_string and std::basic_string_view in order for comparison to be performed in a case-insensitive manner. The header also includes the usual typedefs one would expect for easy use, and a function dp::traits_cast to convert one stringlike which uses one set of traits to one which uses another set of traits. At present this class only supports char and wchar_t traits; and all objects are found in namespace dp.

List of features
ci_traits<T> A character traits class which allows for case-insensitive comparison
ci_char_traits
ci_wchar_traits 		Typedefs for ci_traits<char> and ci_traits<wchar_t>, which may prove useful in C++98 to avoid the improper parsing of closing template braces.
traits_cast A function which accepts a stringlike of one set of traits, and returns that stringlike with the same content but another set of traits.
ci_string
ci_wstring 		Typedefs for std::basic_string<char, ci_traits<char> > and std::basic_string<wchar_t, ci_traits<wchar_t> > respectively.
ci_string_view
ci_wstring_view 		If std::string_view is available, these are typedefs for std::basic_string_view<char, ci_traits<char> > and std::basic_string_view<wchar_t, ci_traits<wchar_t> > respectively.
If not, then they are typedefs for my class dp::basic_string_view with the same template parameters for each. dp::basic_string_view is not a dependency of this header.

Sample Code

void use_string(std::string_view in_str){
    //Make a case-insensitive view
    auto in_ci = dp::traits_cast<ci_char_traits>(in_str);
    //Perform comparison in case-insensitive way
    if(in_ci == "ABORT") return;
    
    //Continue with function below....
}
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