std::numpunct<CharT>::truename, do_truename, falsename, do_falsename
Defined in header <locale> |
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(2) | |
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(4) |
1,2) Public member function, calls the member function
do_truename and do_falsename of the most derived class respectively.
3) Returns the string to be used as the representation of the boolean value
true.
4) Returns the string to be used as the representation of the boolean value
false.
Return value
1,3) The object of type
string_type to use as the representation of true. The standard specializations of std::numpunct return "true" and L"true".
2,4) The object of type
string_type to use as the representation of false. The standard specializations of std::numpunct return "false" and L"false".
Example
#include <iomanip>
#include <iostream>
#include <locale>
struct custom_tf : std::numpunct<char>
{
std::string do_truename() const { return {'t'}; }
std::string do_falsename() const { return {'f'}; }
};
int main()
{
std::cout << std::boolalpha;
// default boolalpha output
std::cout << "Default locale,\n"
" boolalpha true: " << true << "\n"
" boolalpha false: " << false << "\n\n";
// with custom_tf applied to locale
std::cout.imbue(std::locale(std::cout.getloc(), new custom_tf));
std::cout << "Locale with modified numpunct,\n"
" boolalpha true: " << true << "\n"
" boolalpha false: " << false << '\n';
}Output:
Default locale,
boolalpha true: true
boolalpha false: false
Locale with modified numpunct,
boolalpha true: t
boolalpha false: f© cppreference.com
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https://en.cppreference.com/w/cpp/locale/numpunct/truefalsename