what c++ standard says?

[toton]

Hi,
Here are a few of my questions, just to know what C++ standard says
(I don't have a standard manual ) , not the platform specific task.
May be an one liner answer (even one word answer ) is good.
1) Is RTTI (i.e dynamic_cast etc ) are optional , like as in MSVC it
need to be enabled, or always present.
2) what is type of char (and wchar_t) signed or unsigned ?
3) size_t is in namespace std or may be outsize also (in C++, not in
C) . Which header defines it in standard (i.e which header always
defines it)

 

[Alf P. Steinbach]

* toton:

Hi,
Here are a few of my questions, just to know what C++ standard says
(I don't have a standard manual ) , not the platform specific task.
May be an one liner answer (even one word answer ) is good.
1) Is RTTI (i.e dynamic_cast etc ) are optional , like as in MSVC it
need to be enabled, or always present.

RTTI support isn't optional for standard C++.

2) what is type of char (and wchar_t) signed or unsigned ?

Implementation dependent. Use e.g. 'unsigned char' where you need a
particular signedness.

3) size_t is in namespace std or may be outsize also (in C++, not in
C) . Which header defines it in standard (i.e which header always
defines it)

IIRC, <cstddef>.

 

[Kai-Uwe Bux]

Hi,
Here are a few of my questions, just to know what C++ standard says
(I don't have a standard manual ) , not the platform specific task.
May be an one liner answer (even one word answer ) is good.
1) Is RTTI (i.e dynamic_cast etc ) are optional , like as in MSVC it
need to be enabled, or always present.

Not optional.

2) what is type of char (and wchar_t) signed or unsigned ?

There are three distinct types:

char
signed char
unsigned char

The type signed char is signed, the type unsigned char is unsigned, and the
type char is required to have the same set of values and the same value
representation as one of the other types. Which one is implementation
defined. Sometimes you can choose through a compiler switch.


As for wchar_t, the standard says [3.9.1]

Type wchar_t is a distinct type whose values can represent distinct codes
for all members of the largest extended character set specified among the
supported locales (22.1.1). Type wchar_t shall have the same size,
signedness, and alignment requirements (3.9) as one of the other integral
types, called its underlying type.

3) size_t is in namespace std or may be outsize also (in C++, not in C) .
Which header defines it in standard (i.e which header always defines it)

<cstddef> puts size_t in namespace std; and <stddef.h> put it in global
namespace.


Best

Kai-Uwe Bux

 

[toton]

Hi,
Here are a few of my questions, just to know what C++ standard says
(I don't have a standard manual ) , not the platform specific task.
May be an one liner answer (even one word answer ) is good.
1) Is RTTI (i.e dynamic_cast etc ) are optional , like as in MSVC it
need to be enabled, or always present.

Not optional.

2) what is type of char (and wchar_t) signed or unsigned ?

There are three distinct types:

char
signed char
unsigned char

The type signed char is signed, the type unsigned char is unsigned, and the
type char is required to have the same set of values and the same value
representation as one of the other types. Which one is implementation
defined. Sometimes you can choose through a compiler switch.

As for wchar_t, the standard says [3.9.1]

Type wchar_t is a distinct type whose values can represent distinct codes
for all members of the largest extended character set specified among the
supported locales (22.1.1). Type wchar_t shall have the same size,
signedness, and alignment requirements (3.9) as one of the other integral
types, called its underlying type.

3) size_t is in namespace std or may be outsize also (in C++, not in C) .
Which header defines it in standard (i.e which header always defines it)

<cstddef> puts size_t in namespace std; and <stddef.h> put it in global
namespace.

Best

Kai-Uwe Bux

Thanks to both of you for answering precisely what I needed.
And thanks to the newsgroup.

abir