std::ctype<char>::is

Header: <locale>

1. Checks if the character c is classified by the mask m according to the classification table returned by the member function table(). Effectively calculates table()[(unsigned char)c] & m.

# Declarations

bool is( mask m, char c ) const;

const char* is( const char* low, const char* high, mask* vec ) const;

# Parameters

• c: character to classify
• m: mask to use for classifying a single character
• low: pointer to the first character in an array of characters to classify
• high: one past the end pointer for the array of characters to classify
• vec: pointer to the first element of the array of masks to fill

# Notes

Unlike the primary template std::ctype, this specialization does not perform a virtual function call when classifying characters. To customize the behavior, a derived class may provide a non-default classification table to the base class constructor.

# Example

This section is incompleteReason: no example

# Defect reports

# See also

• do_is