On the introduction page of Boost.Preprocessor, an example is given in A.4.1.1 Horizontal Repetition #define TINY_print(z, n, data) data #define TINY_size(z, n, unused) \ template <BOOST_PP_ENUM_PARAMS(n, class T)> \ struct tiny_size< \ BOOST_PP_ENUM_PARAMS(n,T) \ BOOST_PP_COMMA_IF(n) \ BOOST_PP_ENUM( \ BOOST_PP_SUB(TINY_MAX_SIZE,n), TINY_print, none) \ > \ : mpl::int_<n> {}; BOOST_PP_REPEAT(TINY_MAX_SIZE, TINY_size, ~) // Oh! a tilde! #undef … Read more
After changing the keyboard (System Preferences>Keyboard>Input Sources) from ‘US International – PC’ to ‘U.S.’, I was able to verify tilde sign (~) works as expected from Terminal. It looks like in some of the macbook, the keyboard is set to ‘US International – PC’ instead of ‘U.S.’
Well, a webserver is free to use any character after the leading URI part for whatever purpose it wants. That being said, the use of ~ generally hearkens back to the early days of the web, when just about every web server ran on Unix. In the Unix world, systems supported multiple users, each with … Read more
http://www.w3.org/TR/selectors/ 8.3.2. General sibling combinator The general sibling combinator is made of the “tilde” (U+007E, ~) character that separates two sequences of simple selectors. The elements represented by the two sequences share the same parent in the document tree and the element represented by the first sequence precedes (not necessarily immediately) the element represented by … Read more
int(True) is 1. 1 is: 00000001 and ~1 is: 11111110 Which is -2 in Two’s complement1 1 Flip all the bits, add 1 to the resulting number and interpret the result as a binary representation of the magnitude and add a negative sign (since the number begins with 1): 11111110 → 00000001 → 00000010 ↑ … Read more
It is just a shorthand for “same as in declaration”. Some IDEs, e.g. IntelliJ use this too. The files on disk do not have this notation, which is only a compaction in the IDE GUI.
If the variable var is input by the user, eval should not be used to expand the tilde using eval var=$var # Do not use this! The reason is: the user could by accident (or by purpose) type for example var=”$(rm -rf $HOME/)” with possible disastrous consequences. A better (and safer) way is to use … Read more
~ is the destructor Destructors are invoked automatically, and cannot be invoked explicitly. Destructors cannot be overloaded. Thus, a class can have, at most, one destructor. Destructors are not inherited. Thus, a class has no destructors other than the one, which may be declared in it. Destructors cannot be used with structs. They are only … Read more