std::numpunct<CharT>::truename, do_truename, falsename, do_falsename
Defined in header <locale> |
||
---|---|---|
public: string_type truename() const; |
(1) | |
public: string_type falsename() const; |
(2) | |
protected: virtual string_type do_truename() const; |
(3) | |
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
#include <iostream> #include <locale> #include <iomanip> 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
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