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ASS++ is an interactive/REPL C++11/14 code assistant inspired to GHCi.

It can be used through vim or interactively as a command line shell. It supports both gcc and clang compilers, libstdc++, libc++, few boost headers and the functional cat library (

It features pre-compiled headers and tab completion for commands, filenames and C++ identifiers.

C++ statements are evaluated on the fly, possibly using the source code loaded, no matter if it is a complete snippet (with or without main function) or a class declaration. Namespaces are deduced parsing the source code and members declared therein are accessible through automatic using-namespace declarations.

In addition, ASS++ provides some C++ goodies that allow to test code quickly.

It provides an oracle class O that can be injected into containers, and few utility functions.

S() stringifies showable expressions (STL containers, tuples, smart pointers, chrono and streamable types); type names can be demangled with type_name<T>()/type_of() and ranges ala Haskell are available through the R function which generates a suitable std::initializer_list.


cabal install --only-dep 
runhaskell Setup configure --user
runhaskell Setup build 
runhaskell Setup install

At the first run don't forget to build pre-compiled headers with:

ass --build 


Ass++: a REPL C++11/14 assistant

Usage: ass [-c|--check TARGET] [-l|--load TARGET] [-v|--version]
	       [-B|--build] [-i|--interactive] [-p|--preload] [-b|--boost]
	       [-a|--cat] [-- [COMPILER OPTs...] -- [PROG ARGs...]]

Available options:
  -h,--help                Show this help text
  -c,--check TARGET        Check header
  -l,--load TARGET         Preload module/header
  -v,--version             Print version
  -B,--build               (Re)build PHC headers
  -i,--interactive         Start interactive session
  -p,--preload             Preload C++ library (auto include)
  -b,--boost               Preload boost library (PHC)
  -a,--cat                 Preload cat library (PHC)


ASS++, version 3.0 :? for help
Compilers found: g++-5 g++-4.9 g++-4.8 g++-4.7 g++-4.6 clang++35 clang++36
Using Gcc5 compiler...
Ass Gcc5>

Ass Gcc5> :?
Commands available from the prompt:

<statement>                 evaluate/run C++ <statement>
  :include file             add include in the buffer
  :load file                load file in the buffer
  :reload                   reload the file
  :edit                     edit the buffer
  :list                     list the buffer
  :clear                    clear the buffer
  :next                     switch to next compiler
  :args ARG1 ARG2...        set runtime arguments
  :run [ARG1 ARG2...]       run the main function
  :rr                       reload and run the main function
  :info TYPE                show info about the given TYPE
  :preload                  toggle preload std headers
  :verbose                  show additional information
  :quit                     quit
  :?                        print this help

C++ goodies:
  _s _h,_min,_s,_ms,_us...  string and chrono user-defined literals
  T(1,2,3)                  tuple/pair constructor
  P(arg1, arg2, ...)        variadic print
  type_name<type>()         demangle the name of a type
  type_of(v)                deduce the type of a given expression
  R(1,2,5)                  range: initializer_list<int> {1,2,3,4,5}
  S(v)                      stringify a value
  hex(v), oct(v), bin(v)    show manipulators
  class O                   oracle class.

Using Gcc5 compiler...
Ass> vector<int> v = R(1,2,10); return v;
[ 1 2 3 4 5 6 7 8 9 10 ] [ExitSuccess]
Ass> return _("hello world", 42);
("hello world",42) [ExitSuccess]
Ass> auto x = O{}; auto y (std::move(x)); return y;
O() O(O&&) ~O() O@0x7fffad138640 ~O() [ExitSuccess]
Ass> return system_clock::now();
1388498574873117227_ns [ExitSuccess]
Ass> :load test.cpp 
loading test.cpp...
Ass> :list 
#include <iostream>
#include <vector>

template <typename T>
using test = std::vector<T>;

main(int argc, char *argv[])
    std::cout << "argc = " << argc << std::endl;
    return 0;

Ass> :run 1 2
argc = 3
Ass> auto x = test<int>{1,2,3}; return x;
[ 1 2 3 ] [ExitSuccess]

Ass> :info int
type name: int
is_const: false
is_volatile: false
is_trivial: true
is_standard_layout: true
is_pod: true
is_literal_type: true
is_empty: false
is_polymorphic: false
is_abstract: false
is_signed: true
is_unsigned: false
is_constructible: true
is_nothrow_constructible: true
is_trivially_copyable: true
is_trivially_constructible: true
is_trivially_default_constructible: true
is_trivially_copy_constructible: true
is_trivially_move_constructible: true
is_trivially_copy_assignable: true
is_trivially_move_assignable: true
is_default_constructible: true
is_nothrow_default_constructible: true
is_copy_constructible: true
is_nothrow_copy_constructible: true
is_move_constructible: true
is_nothrow_move_constructible: true
is_copy_assignable: true
is_nothrow_copy_assignable: true
is_nothrow_move_assignable: true
is_destructible: true
is_move_assignable: true
is_trivially_destructible: true
is_nothrow_destructible: true
has_virtual_destructor: false
sizeof   : 4
alignment: 4
default  : {????}
uniform  : {0000}
value    : {0000}

Ass> :quit
Leaving Ass++. 


REPL C++11/14 code assistant




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