std::numpunct<CharT>:: truename, do_truename, falsename, do_falsename
From cppreference.com
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Defined in header
<locale>
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public
:
string_type truename ( ) const ; |
(1) | |
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public
:
string_type falsename ( ) const ; |
(2) | |
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protected
:
virtual string_type do_truename ( ) const ; |
(3) | |
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protected
:
virtual string_type do_falsename ( ) const ; |
(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
Run this code
#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