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21.2 Fundamental Data Types
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21.2 Fundamental Data Types
The standard library describes a specific type by providing a specialized implementation of the numeric_limits class for the type. Static functions and static constant data members then provide information specific to the type. The standard library includes descriptions of the following fundamental data types.
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bool |
char |
int |
float |
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signed char |
short |
double |
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unsigned char |
long |
long double |
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wchar_t |
unsigned short |
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unsigned int |
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unsigned long |
Certain implementations may also provide information on other data types. Whether or not an implementation is described can be discovered using the static data member field is_specialized. For example, the following is legal, and will indicate that the string data type is not described by this mechanism.
cout << "are strings described " << numeric_limits<string>::is_specialized << endl;
For data types that do not have a specialization, the values yielded by the functions and data fields in numeric_limits are generally zero or false.
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