std::char_traits::to_int_type (3) Linux Manual Page

std::char_traits<CharT>::to_int_type – std::char_traits<CharT>::to_int_type

Synopsis

static int_type to_int_type( char_type c );                     (until C++11)

static constexpr int_type to_int_type( char_type c ) noexcept;  (since C++11)

Converts a value of char_type to int_type.

Parameters

c – value to convert

Return value

A value equivalent to c.

Complexity

Constant.

Notes

For every valid value of char_type, there must be a unique value of int_type distinct from eof(). For example, a common implementation of char_traits<char>::eof() is return -1, and a corresponding valid implementation of char_traits<char>::to_int_type(c) is return (unsigned char)c.