BlackMATov/kari.hpp
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Merge pull request #13 from BlackMATov/dev-v2.x.x

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Dev v2.x.x
This commit is contained in:
Matvey Cherevko
2020-12-11 14:45:47 +07:00
committed by GitHub
parent fa67d32387 6b6f2e7914
commit 514fc381c4
5 changed files with 955 additions and 1123 deletions
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142
README.md
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@@ -52,14 +52,16 @@ target_link_libraries(your_project_target kari.hpp)
### Basic currying ### Basic currying
```cpp ```cpp
using namespace kari_hpp;
auto foo = [](int v1, int v2, int v3) { auto foo = [](int v1, int v2, int v3) {
return v1 + v2 + v3; return v1 + v2 + v3;
}; };
auto c0 = kari::curry(foo); // currying of `foo` function auto c0 = curry(foo); // currying of `foo` function
auto c1 = c0(10); // apply to first argument auto c1 = c0(10); // apply to first argument
auto c2 = c1(20); // apply to second argument auto c2 = c1(20); // apply to second argument
auto rr = c2(12); // apply to third argument and call the `foo` function auto rr = c2(12); // apply to third argument and call the `foo` function
// output: 42 // output: 42
std::cout << rr << std::endl; std::cout << rr << std::endl;
@@ -68,13 +70,14 @@ std::cout << rr << std::endl;
### Partial application of curried functions ### Partial application of curried functions
```cpp ```cpp
auto foo = [](int v1, int v2, int v3, int v4) { using namespace kari_hpp;
curry_t c0 = [](int v1, int v2, int v3, int v4) {
return v1 + v2 + v3 + v4; return v1 + v2 + v3 + v4;
}; };
auto c0 = kari::curry(foo); // currying auto c1 = c0(15, 20); // partial application of two arguments
auto c1 = c0(15, 20); // partial application of two arguments auto rr = c1(2, 5); // partial application and call `(15,20,2,5)`
auto rr = c1(2, 5); // partial application and call `foo(15,20,2,5)`
// output: 42 // output: 42
std::cout << rr << std::endl; std::cout << rr << std::endl;
@@ -83,17 +86,19 @@ std::cout << rr << std::endl;
### Calling nested curried functions ### Calling nested curried functions
```cpp ```cpp
auto boo = [](int v1, int v2) { using namespace kari_hpp;
return v1 + v2;
curry_t boo = [](int a, int b) {
return a + b;
}; };
auto foo = [boo](int v1, int v2) { curry_t foo = [boo](int a, int b) {
return kari::curry(boo, v1 + v2); return boo(a + b);
}; };
auto c0 = kari::curry(foo)(38,3,1); auto c0 = foo(38,3,1);
auto c1 = kari::curry(foo)(38,3)(1); auto c1 = foo(38,3)(1);
auto c2 = kari::curry(foo)(38)(3,1); auto c2 = foo(38)(3,1);
// output: 42,42,42 // output: 42,42,42
std::cout << c0 << "," << c1 << "," << c2 << std::endl; std::cout << c0 << "," << c1 << "," << c2 << std::endl;
@@ -102,19 +107,21 @@ std::cout << c0 << "," << c1 << "," << c2 << std::endl;
### Binding member functions and member objects ### Binding member functions and member objects
```cpp ```cpp
struct Foo { using namespace kari_hpp;
struct foo_t {
int v = 40; int v = 40;
int addV(int add) { int add_v(int add) {
v += add; v += add;
return v; return v;
} }
} foo; } foo;
auto c0 = kari::curry(&Foo::addV); auto c0 = curry(&foo_t::add_v);
auto c1 = kari::curry(&Foo::v); auto c1 = curry(&foo_t::v);
auto r0 = c0(std::ref(foo))(2); auto r0 = c0(std::ref(foo))(2);
auto r1 = c1(foo); auto r1 = c1(std::cref(foo));
// output: 42,42 // output: 42,42
std::cout << r0 << "," << r1 << std::endl; std::cout << r0 << "," << r1 << std::endl;
@@ -123,15 +130,9 @@ std::cout << r0 << "," << r1 << std::endl;
## API ## API
```cpp ```cpp
namespace kari { namespace kari_hpp {
template < typename F, typename... Args > template < typename F, typename... Args >
constexpr decltype(auto) curry(F&& f, Args&&... args) const; constexpr auto curry(F&& f, Args&&... args);
template < typename F, typename... Args >
constexpr decltype(auto) curryV(F&& f, Args&&... args) const;
template < std::size_t N, typename F, typename... Args >
constexpr decltype(auto) curryN(F&& f, Args&&... args) const;
template < typename F > template < typename F >
struct is_curried; struct is_curried;
@@ -139,59 +140,34 @@ namespace kari {
template < typename F > template < typename F >
inline constexpr bool is_curried_v = is_curried<F>::value; inline constexpr bool is_curried_v = is_curried<F>::value;
template < std::size_t N, typename F, typename... Args > template < typename F, typename... Args >
struct curry_t { class curry_t {
constexpr curry_t(F f);
template < typename... As > template < typename... As >
constexpr decltype(auto) operator()(As&&... as) const; constexpr auto operator()(As&&... as) const;
}; };
} }
``` ```
--- ---
### `kari::curry(F&& f, Args&&... args)` ### `kari_hpp::curry(F&& f, Args&&... args)`
Returns a curried function **`f`** or copy the function result with **`args`** arguments. Returns a curried function **`f`** or copy the function result with **`args`** arguments.
--- ---
### `kari::curryV(F&& f, Args&&... args)` ### `kari_hpp::is_curried<F>, kari_hpp::is_curried_v<F>`
Allows carrying variadic functions.
```cpp
auto c0 = kari::curryV(std::printf, "%d + %d = %d");
auto c1 = c0(37, 5);
auto c2 = c1(42);
// force calling carried variadic function
c2(); // output: 37 + 5 = 42
```
---
### `kari::curryN(F&& f, Args&&... args)`
Allows carrying variadic functions for **`N`** arguments.
```cpp
char buffer[256] = {'\0'};
auto c = kari::curryN<3>(std::snprintf, buffer, 256, "%d + %d = %d");
c(37, 5, 42);
std::cout << buffer << std::endl; // output: 37 + 5 = 42
```
---
### `kari::is_curried<F>, kari::is_curried_v<F>`
Checks whether F is a curried function type. Checks whether F is a curried function type.
```cpp ```cpp
auto l = [](int v1, int v2){ using namespace kari_hpp;
return v1 + v2;
constexpr curry_t c = [](int a, int b){
return a + b;
}; };
auto c = curry(l);
// output: is `l` curried? no // output: is `l` curried? no
std::cout std::cout
@@ -208,18 +184,19 @@ std::cout
--- ---
### `kari::curry_t::operator()(As&&... as)` ### `kari_hpp::curry_t::operator()(As&&... as)`
Calling operator of curried function for partial application or full application. Returns a new curried function with added new arguments or copy of the function result. Calling operator of curried function for partial application or full application. Returns a new curried function with added new arguments or copy of the function result.
```cpp ```cpp
int foo(int v1, int v2, int v3, int v4) { using namespace kari_hpp;
return v1 + v2 + v3 + v4;
}
auto c0 = kari::curry(foo); // currying curry_t c0 = [](int a, int b, int c, int d) {
auto c1 = c0(15, 20); // partial application return a + b + c + d;
auto rr = c2(2, 5); // function call - foo(15,20,2,5) };
auto c1 = c0(15, 20); // partial application
auto rr = c2(2, 5); // function call - foo(15,20,2,5)
// output: 42 // output: 42
std::cout << rr << std::endl; std::cout << rr << std::endl;
@@ -232,17 +209,17 @@ std::cout << rr << std::endl;
### Section of operators ### Section of operators
```cpp ```cpp
using namespace kari::underscore; using namespace kari_hpp::ext::underscore;
std::vector<int> v{1,2,3,4}; std::vector v{1, 2, 3, 4};
// result: 10 // result: 10
std::accumulate(v.begin(), v.end(), 0, _+_); std::accumulate(v.begin(), v.end(), 0, _ + _);
// v = 2, 3, 6, 8 // v = {2, 4, 6, 8}
std::transform(v.begin(), v.end(), v.begin(), _*2); std::transform(v.begin(), v.end(), v.begin(), _ * 2);
// v = -2,-3,-6,-8 // v = {-2, -4, -6, -8}
std::transform(v.begin(), v.end(), v.begin(), -_); std::transform(v.begin(), v.end(), v.begin(), - _);
``` ```
### Function composition ### Function composition
@@ -250,7 +227,8 @@ std::transform(v.begin(), v.end(), v.begin(), -_);
#### Pipe operator #### Pipe operator
```cpp ```cpp
using namespace kari::underscore; using namespace kari_hpp::ext;
using namespace kari_hpp::ext::underscore;
auto r0 = (_*2) | (_+2) | 4; // (4 * 2) + 2 = 10 auto r0 = (_*2) | (_+2) | 4; // (4 * 2) + 2 = 10
auto r1 = 4 | (_*2) | (_+2); // (4 * 2 + 2) = 10 auto r1 = 4 | (_*2) | (_+2); // (4 * 2 + 2) = 10
@@ -262,7 +240,8 @@ std::cout << r0, << "," << r1 << std::endl;
#### Compose operator #### Compose operator
```cpp ```cpp
using namespace kari::underscore; using namespace kari_hpp::ext;
using namespace kari_hpp::ext::underscore;
auto r0 = (_*2) * (_+2) * 4; // (4 + 2) * 2 = 12 auto r0 = (_*2) * (_+2) * 4; // (4 + 2) * 2 = 12
auto r1 = 4 * (_*2) * (_+2); // (4 * 2 + 2) = 10 auto r1 = 4 * (_*2) * (_+2); // (4 * 2 + 2) = 10
@@ -274,7 +253,8 @@ std::cout << r0, << "," << r1 << std::endl;
### Point-free style for Haskell maniacs ### Point-free style for Haskell maniacs
```cpp ```cpp
using namespace kari::underscore; using namespace kari_hpp::ext;
using namespace kari_hpp::ext::underscore;
// (. (+2)) (*2) $ 10 == 24 // haskell analog // (. (+2)) (*2) $ 10 == 24 // haskell analog
auto r0 = (_*(_+2))(_*2) * 10; auto r0 = (_*(_+2))(_*2) * 10;

554
headers/kari.hpp/kari.hpp
View File

@@ -6,114 +6,68 @@
#pragma once #pragma once
#include <tuple>
#include <limits>
#include <utility>
#include <functional> #include <functional>
#include <tuple>
#include <type_traits> #include <type_traits>
#include <utility>
#define KARI_HPP_NOEXCEPT_RETURN(...) \ namespace kari_hpp
noexcept(noexcept(__VA_ARGS__)) { return __VA_ARGS__; }
#define KARI_HPP_NOEXCEPT_DECLTYPE_RETURN(...) \
noexcept(noexcept(__VA_ARGS__)) -> decltype (__VA_ARGS__) { return __VA_ARGS__; }
namespace kari
{ {
template < std::size_t N, typename F, typename... Args > template < typename F, typename... As >
struct curry_t; class curry_t;
namespace detail namespace impl
{ {
template template < typename F >
< struct is_curried_impl
std::size_t N, typename F, typename... Args, : std::false_type {};
typename std::enable_if_t<
(N == 0) &&
std::is_invocable_v<std::decay_t<F>, Args...>
, int> = 0
>
constexpr auto make_curry(F&& f, std::tuple<Args...>&& args)
KARI_HPP_NOEXCEPT_RETURN(
std::apply(std::forward<F>(f), std::move(args)))
template template < typename F, typename... As >
< struct is_curried_impl<curry_t<F, As...>>
std::size_t N, typename F, typename... Args, : std::true_type {};
typename std::enable_if_t<
(N > 0) ||
!std::is_invocable_v<std::decay_t<F>, Args...>
, int> = 0
>
constexpr auto make_curry(F&& f, std::tuple<Args...>&& args)
KARI_HPP_NOEXCEPT_DECLTYPE_RETURN(
curry_t<
N,
std::decay_t<F>,
Args...
>(std::forward<F>(f), std::move(args)))
template < std::size_t N, typename F >
constexpr auto make_curry(F&& f)
KARI_HPP_NOEXCEPT_DECLTYPE_RETURN(
make_curry<N>(std::forward<F>(f), std::make_tuple()))
} }
template < std::size_t N, typename F, typename... Args > template < typename F >
struct curry_t final { struct is_curried
template < typename U > : impl::is_curried_impl<std::remove_cv_t<F>> {};
constexpr curry_t(U&& u, std::tuple<Args...>&& args)
noexcept(noexcept(F(std::forward<U>(u))) && noexcept(std::tuple<Args...>(std::move(args)))) template < typename F >
: f_(std::forward<U>(u)) inline constexpr bool is_curried_v = is_curried<F>::value;
}
namespace kari_hpp::detail
{
template < typename F, typename... Args >
constexpr auto curry_or_apply(F&& f, std::tuple<Args...>&& args) {
if constexpr ( std::is_invocable_v<std::decay_t<F>, Args...> ) {
return std::apply(std::forward<F>(f), std::move(args));
} else {
return curry_t(std::forward<F>(f), std::move(args));
}
}
}
namespace kari_hpp
{
template < typename F, typename... Args >
class curry_t final {
public:
constexpr curry_t(F f)
: f_(std::move(f)) {}
constexpr curry_t(F f, std::tuple<Args...> args)
: f_(std::move(f))
, args_(std::move(args)) {} , args_(std::move(args)) {}
// min_arity constexpr auto operator()() && {
return detail::curry_or_apply(
constexpr std::size_t min_arity() const noexcept {
return N;
}
// recurry
template < std::size_t M >
constexpr decltype(auto) recurry() &&
noexcept(noexcept(
detail::make_curry<M>(
std::move(std::declval<F>()),
std::move(std::declval<std::tuple<Args...>>()))))
{
return detail::make_curry<M>(
std::move(f_), std::move(f_),
std::move(args_)); std::move(args_));
} }
template < std::size_t M >
constexpr decltype(auto) recurry() const &
noexcept(noexcept(
std::move(std::declval<curry_t>()).template recurry<M>()))
{
return std::move(curry_t(*this)).template recurry<M>();
}
// operator(As&&...)
constexpr decltype(auto) operator()() &&
noexcept(noexcept(
std::move(std::declval<curry_t>()).template recurry<0>()))
{
return std::move(*this).template recurry<0>();
}
template < typename A > template < typename A >
constexpr decltype(auto) operator()(A&& a) && constexpr auto operator()(A&& a) && {
noexcept(noexcept( return detail::curry_or_apply(
detail::make_curry<(N > 0 ? N - 1 : 0)>(
std::move(std::declval<F>()),
std::tuple_cat(
std::move(std::declval<std::tuple<Args...>>()),
std::make_tuple(std::forward<A>(a))))))
{
return detail::make_curry<(N > 0 ? N - 1 : 0)>(
std::move(f_), std::move(f_),
std::tuple_cat( std::tuple_cat(
std::move(args_), std::move(args_),
@@ -121,138 +75,38 @@ namespace kari
} }
template < typename A, typename... As > template < typename A, typename... As >
constexpr decltype(auto) operator()(A&& a, As&&... as) && constexpr auto operator()(A&& a, As&&... as) && {
noexcept(noexcept(
std::move(std::declval<curry_t>())(std::forward<A>(a))(std::forward<As>(as)...)))
{
return std::move(*this)(std::forward<A>(a))(std::forward<As>(as)...); return std::move(*this)(std::forward<A>(a))(std::forward<As>(as)...);
} }
template < typename... As > template < typename... As >
constexpr decltype(auto) operator()(As&&... as) const & constexpr auto operator()(As&&... as) const & {
noexcept(noexcept(
std::move(std::declval<curry_t>())(std::forward<As>(as)...)))
{
return std::move(curry_t(*this))(std::forward<As>(as)...); return std::move(curry_t(*this))(std::forward<As>(as)...);
} }
private: private:
F f_; F f_;
std::tuple<Args...> args_; std::tuple<Args...> args_;
}; };
//
// is_curried, is_curried_v
//
namespace detail
{
template < typename F >
struct is_curried_impl
: std::false_type {};
template < std::size_t N, typename F, typename... Args >
struct is_curried_impl<curry_t<N, F, Args...>>
: std::true_type {};
}
template < typename F >
struct is_curried
: detail::is_curried_impl<std::remove_cv_t<F>> {};
template < typename F >
inline constexpr bool is_curried_v = is_curried<F>::value;
//
// curry
//
template
<
typename F,
typename std::enable_if_t<is_curried_v<std::decay_t<F>>, int> = 0
>
constexpr auto curry(F&& f)
KARI_HPP_NOEXCEPT_DECLTYPE_RETURN(
std::forward<F>(f))
template
<
typename F,
typename std::enable_if_t<!is_curried_v<std::decay_t<F>>, int> = 0
>
constexpr auto curry(F&& f)
KARI_HPP_NOEXCEPT_DECLTYPE_RETURN(
detail::make_curry<0>(std::forward<F>(f)))
template < typename F, typename A, typename... As >
constexpr auto curry(F&& f, A&& a, As&&... as)
KARI_HPP_NOEXCEPT_DECLTYPE_RETURN(
curry(std::forward<F>(f))(std::forward<A>(a), std::forward<As>(as)...))
//
// curryV
//
template
<
typename F,
std::size_t MaxN = std::numeric_limits<std::size_t>::max(),
typename std::enable_if_t<is_curried_v<std::decay_t<F>>, int> = 0
>
constexpr auto curryV(F&& f)
KARI_HPP_NOEXCEPT_DECLTYPE_RETURN(
std::forward<F>(f).template recurry<MaxN>())
template
<
typename F,
std::size_t MaxN = std::numeric_limits<std::size_t>::max(),
typename std::enable_if_t<!is_curried_v<std::decay_t<F>>, int> = 0
>
constexpr auto curryV(F&& f)
KARI_HPP_NOEXCEPT_DECLTYPE_RETURN(
detail::make_curry<MaxN>(std::forward<F>(f)))
template < typename F, typename A, typename... As >
constexpr auto curryV(F&& f, A&& a, As&&... as)
KARI_HPP_NOEXCEPT_DECLTYPE_RETURN(
curryV(std::forward<F>(f))(std::forward<A>(a), std::forward<As>(as)...))
//
// curryN
//
template
<
std::size_t N, typename F,
typename std::enable_if_t<is_curried_v<std::decay_t<F>>, int> = 0
>
constexpr auto curryN(F&& f)
KARI_HPP_NOEXCEPT_DECLTYPE_RETURN(
std::forward<F>(f).template recurry<N>())
template
<
std::size_t N, typename F,
typename std::enable_if_t<!is_curried_v<std::decay_t<F>>, int> = 0
>
constexpr auto curryN(F&& f)
KARI_HPP_NOEXCEPT_DECLTYPE_RETURN(
detail::make_curry<N>(std::forward<F>(f)))
template
<
std::size_t N, typename F, typename A, typename... As,
std::size_t Args = sizeof...(As) + 1,
std::size_t MaxN = std::numeric_limits<std::size_t>::max(),
typename std::enable_if_t<(MaxN - Args >= N), int> = 0
>
constexpr auto curryN(F&& f, A&& a, As&&... as)
KARI_HPP_NOEXCEPT_DECLTYPE_RETURN(
curryN<N + Args>(std::forward<F>(f))(std::forward<A>(a), std::forward<As>(as)...))
} }
namespace kari namespace kari_hpp
{
template < typename F >
constexpr auto curry(F&& f) {
if constexpr ( is_curried_v<std::decay_t<F>> ) {
return std::forward<F>(f);
} else {
return detail::curry_or_apply(std::forward<F>(f), {});
}
}
template < typename F, typename A, typename... As >
constexpr auto curry(F&& f, A&& a, As&&... as) {
return curry(std::forward<F>(f))(std::forward<A>(a), std::forward<As>(as)...);
}
}
namespace kari_hpp::ext
{ {
// //
// fid // fid
@@ -260,9 +114,9 @@ namespace kari
struct fid_t { struct fid_t {
template < typename A > template < typename A >
constexpr auto operator()(A&& a) const constexpr auto operator()(A&& a) const {
KARI_HPP_NOEXCEPT_DECLTYPE_RETURN( return std::forward<A>(a);
std::forward<A>(a)) }
}; };
inline constexpr auto fid = curry(fid_t{}); inline constexpr auto fid = curry(fid_t{});
@@ -272,9 +126,9 @@ namespace kari
struct fconst_t { struct fconst_t {
template < typename A, typename B > template < typename A, typename B >
constexpr auto operator()(A&& a, B&&) const constexpr auto operator()(A&& a, [[maybe_unused]] B&& b) const {
KARI_HPP_NOEXCEPT_DECLTYPE_RETURN( return std::forward<A>(a);
std::forward<A>(a)) }
}; };
inline constexpr auto fconst = curry(fconst_t{}); inline constexpr auto fconst = curry(fconst_t{});
@@ -284,12 +138,9 @@ namespace kari
struct fflip_t { struct fflip_t {
template < typename F, typename A, typename B > template < typename F, typename A, typename B >
constexpr auto operator()(F&& f, A&& a, B&& b) const constexpr auto operator()(F&& f, A&& a, B&& b) const {
KARI_HPP_NOEXCEPT_DECLTYPE_RETURN( return curry(std::forward<F>(f), std::forward<B>(b), std::forward<A>(a));
curry( }
std::forward<F>(f),
std::forward<B>(b),
std::forward<A>(a)))
}; };
inline constexpr auto fflip = curry(fflip_t{}); inline constexpr auto fflip = curry(fflip_t{});
@@ -299,13 +150,11 @@ namespace kari
struct fpipe_t { struct fpipe_t {
template < typename G, typename F, typename A > template < typename G, typename F, typename A >
constexpr auto operator()(G&& g, F&& f, A&& a) const constexpr auto operator()(G&& g, F&& f, A&& a) const {
KARI_HPP_NOEXCEPT_DECLTYPE_RETURN( return curry(
curry(
std::forward<F>(f), std::forward<F>(f),
curry( curry(std::forward<G>(g), std::forward<A>(a)));
std::forward<G>(g), }
std::forward<A>(a))))
}; };
inline constexpr auto fpipe = curry(fpipe_t{}); inline constexpr auto fpipe = curry(fpipe_t{});
@@ -315,13 +164,11 @@ namespace kari
struct fcompose_t { struct fcompose_t {
template < typename G, typename F, typename A > template < typename G, typename F, typename A >
constexpr auto operator()(G&& g, F&& f, A&& a) const constexpr auto operator()(G&& g, F&& f, A&& a) const {
KARI_HPP_NOEXCEPT_DECLTYPE_RETURN( return curry(
curry(
std::forward<G>(g), std::forward<G>(g),
curry( curry(std::forward<F>(f), std::forward<A>(a)));
std::forward<F>(f), }
std::forward<A>(a))))
}; };
inline constexpr auto fcompose = curry(fcompose_t{}); inline constexpr auto fcompose = curry(fcompose_t{});
@@ -329,144 +176,125 @@ namespace kari
// fpipe operators // fpipe operators
// //
template template < typename G, typename F
< , std::enable_if_t<std::disjunction_v<
typename G, typename F, is_curried<std::decay_t<G>>,
typename std::enable_if_t<is_curried_v<std::decay_t<G>>, int> = 0, is_curried<std::decay_t<F>>>, int> = 0 >
typename std::enable_if_t<is_curried_v<std::decay_t<F>>, int> = 0 constexpr auto operator|(G&& g, F&& f) {
> constexpr bool gc = is_curried_v<std::decay_t<G>>;
constexpr auto operator|(G&& g, F&& f) constexpr bool fc = is_curried_v<std::decay_t<F>>;
KARI_HPP_NOEXCEPT_DECLTYPE_RETURN(
fpipe(
std::forward<G>(g),
std::forward<F>(f)))
template if constexpr ( gc && fc ) {
< return fpipe(std::forward<G>(g), std::forward<F>(f));
typename F, typename A, }
typename std::enable_if_t< is_curried_v<std::decay_t<F>>, int> = 0,
typename std::enable_if_t<!is_curried_v<std::decay_t<A>>, int> = 0
>
constexpr auto operator|(F&& f, A&& a)
KARI_HPP_NOEXCEPT_DECLTYPE_RETURN(
std::forward<F>(f)(std::forward<A>(a)))
template if constexpr ( gc && !fc) {
< return std::forward<G>(g)(std::forward<F>(f));
typename A, typename F, }
typename std::enable_if_t<!is_curried_v<std::decay_t<A>>, int> = 0,
typename std::enable_if_t< is_curried_v<std::decay_t<F>>, int> = 0 if constexpr ( !gc && fc) {
> return std::forward<F>(f)(std::forward<G>(g));
constexpr auto operator|(A&& a, F&& f) }
KARI_HPP_NOEXCEPT_DECLTYPE_RETURN(
std::forward<F>(f)(std::forward<A>(a))) static_assert(gc || fc, "F or G or both arguments should be curried");
}
// //
// fcompose operators // fcompose operators
// //
template template < typename G, typename F
< , std::enable_if_t<std::disjunction_v<
typename G, typename F, is_curried<std::decay_t<G>>,
typename std::enable_if_t<is_curried_v<std::decay_t<G>>, int> = 0, is_curried<std::decay_t<F>>>, int> = 0 >
typename std::enable_if_t<is_curried_v<std::decay_t<F>>, int> = 0 constexpr auto operator*(G&& g, F&& f) {
> constexpr bool gc = is_curried_v<std::decay_t<G>>;
constexpr auto operator*(G&& g, F&& f) constexpr bool fc = is_curried_v<std::decay_t<F>>;
KARI_HPP_NOEXCEPT_DECLTYPE_RETURN(
fcompose(
std::forward<G>(g),
std::forward<F>(f)))
template if constexpr ( gc && fc ) {
< return fcompose(std::forward<G>(g), std::forward<F>(f));
typename F, typename A, }
typename std::enable_if_t< is_curried_v<std::decay_t<F>>, int> = 0,
typename std::enable_if_t<!is_curried_v<std::decay_t<A>>, int> = 0
>
constexpr auto operator*(F&& f, A&& a)
KARI_HPP_NOEXCEPT_DECLTYPE_RETURN(
std::forward<F>(f)(std::forward<A>(a)))
template if constexpr ( gc && !fc) {
< return std::forward<G>(g)(std::forward<F>(f));
typename A, typename F, }
typename std::enable_if_t<!is_curried_v<std::decay_t<A>>, int> = 0,
typename std::enable_if_t< is_curried_v<std::decay_t<F>>, int> = 0
>
constexpr auto operator*(A&& a, F&& f)
KARI_HPP_NOEXCEPT_DECLTYPE_RETURN(
std::forward<F>(f)(std::forward<A>(a)))
}
namespace kari if constexpr ( !gc && fc) {
{ return std::forward<F>(f)(std::forward<G>(g));
namespace underscore }
{
struct us_t {};
inline constexpr us_t _{};
// static_assert(gc || fc, "F or G or both arguments should be curried");
// is_underscore, is_underscore_v
//
template < typename T >
struct is_underscore
: std::bool_constant<std::is_same_v<us_t, std::remove_cv_t<T>>> {};
template < typename T >
inline constexpr bool is_underscore_v = is_underscore<T>::value;
//
// unary operators
//
#define KARI_HPP_DEFINE_UNDERSCORE_UNARY_OP(op, func) \
constexpr auto operator op (us_t) KARI_HPP_NOEXCEPT_DECLTYPE_RETURN(curry(func))
KARI_HPP_DEFINE_UNDERSCORE_UNARY_OP(-, std::negate<>())
KARI_HPP_DEFINE_UNDERSCORE_UNARY_OP(~, std::bit_not<>())
KARI_HPP_DEFINE_UNDERSCORE_UNARY_OP(!, std::logical_not<>())
#undef KARI_HPP_DEFINE_UNDERSCORE_UNARY_OP
//
// binary operators
//
#define KARI_HPP_DEFINE_UNDERSCORE_BINARY_OP(op, func) \
constexpr auto operator op (us_t, us_t) \
KARI_HPP_NOEXCEPT_DECLTYPE_RETURN(curry(func)) \
\
template < typename A, typename std::enable_if_t<!is_underscore_v<std::decay_t<A>>, int> = 0 > \
constexpr auto operator op (A&& a, us_t) \
KARI_HPP_NOEXCEPT_DECLTYPE_RETURN(curry(func, std::forward<A>(a))) \
\
template < typename B, typename std::enable_if_t<!is_underscore_v<std::decay_t<B>>, int> = 0 > \
constexpr auto operator op (us_t, B&& b) \
KARI_HPP_NOEXCEPT_DECLTYPE_RETURN(fflip(func, std::forward<B>(b)))
KARI_HPP_DEFINE_UNDERSCORE_BINARY_OP(+ , std::plus<>())
KARI_HPP_DEFINE_UNDERSCORE_BINARY_OP(- , std::minus<>())
KARI_HPP_DEFINE_UNDERSCORE_BINARY_OP(* , std::multiplies<>())
KARI_HPP_DEFINE_UNDERSCORE_BINARY_OP(/ , std::divides<>())
KARI_HPP_DEFINE_UNDERSCORE_BINARY_OP(% , std::modulus<>())
KARI_HPP_DEFINE_UNDERSCORE_BINARY_OP(< , std::less<>())
KARI_HPP_DEFINE_UNDERSCORE_BINARY_OP(> , std::greater<>())
KARI_HPP_DEFINE_UNDERSCORE_BINARY_OP(<=, std::less_equal<>())
KARI_HPP_DEFINE_UNDERSCORE_BINARY_OP(>=, std::greater_equal<>())
KARI_HPP_DEFINE_UNDERSCORE_BINARY_OP(==, std::equal_to<>())
KARI_HPP_DEFINE_UNDERSCORE_BINARY_OP(!=, std::not_equal_to<>())
KARI_HPP_DEFINE_UNDERSCORE_BINARY_OP(| , std::bit_or<>())
KARI_HPP_DEFINE_UNDERSCORE_BINARY_OP(& , std::bit_and<>())
KARI_HPP_DEFINE_UNDERSCORE_BINARY_OP(^ , std::bit_xor<>())
KARI_HPP_DEFINE_UNDERSCORE_BINARY_OP(||, std::logical_or<>())
KARI_HPP_DEFINE_UNDERSCORE_BINARY_OP(&&, std::logical_and<>())
#undef KARI_HPP_DEFINE_UNDERSCORE_BINARY_OP
} }
} }
#undef KARI_HPP_NOEXCEPT_RETURN namespace kari_hpp::ext::underscore
#undef KARI_HPP_NOEXCEPT_DECLTYPE_RETURN {
struct us_t {};
inline constexpr us_t _{};
//
// is_underscore, is_underscore_v
//
template < typename T >
struct is_underscore
: std::bool_constant<std::is_same_v<us_t, std::remove_cv_t<T>>> {};
template < typename T >
inline constexpr bool is_underscore_v = is_underscore<T>::value;
//
// unary operators
//
#define KARI_HPP_DEFINE_UNDERSCORE_UNARY_OP(op, func)\
constexpr auto operator op (us_t) {\
return curry(func);\
}
KARI_HPP_DEFINE_UNDERSCORE_UNARY_OP(-, std::negate<>())
KARI_HPP_DEFINE_UNDERSCORE_UNARY_OP(~, std::bit_not<>())
KARI_HPP_DEFINE_UNDERSCORE_UNARY_OP(!, std::logical_not<>())
#undef KARI_HPP_DEFINE_UNDERSCORE_UNARY_OP
//
// binary operators
//
#define KARI_HPP_DEFINE_UNDERSCORE_BINARY_OP(op, func)\
constexpr auto operator op (us_t, us_t) {\
return curry(func);\
}\
\
template < typename A, std::enable_if_t<!is_underscore_v<std::decay_t<A>>, int> = 0 >\
constexpr auto operator op (A&& a, us_t) {\
return curry(func, std::forward<A>(a));\
}\
\
template < typename B, std::enable_if_t<!is_underscore_v<std::decay_t<B>>, int> = 0 >\
constexpr auto operator op (us_t, B&& b) {\
return fflip(func, std::forward<B>(b));\
}
KARI_HPP_DEFINE_UNDERSCORE_BINARY_OP(+ , std::plus<>())
KARI_HPP_DEFINE_UNDERSCORE_BINARY_OP(- , std::minus<>())
KARI_HPP_DEFINE_UNDERSCORE_BINARY_OP(* , std::multiplies<>())
KARI_HPP_DEFINE_UNDERSCORE_BINARY_OP(/ , std::divides<>())
KARI_HPP_DEFINE_UNDERSCORE_BINARY_OP(% , std::modulus<>())
KARI_HPP_DEFINE_UNDERSCORE_BINARY_OP(< , std::less<>())
KARI_HPP_DEFINE_UNDERSCORE_BINARY_OP(> , std::greater<>())
KARI_HPP_DEFINE_UNDERSCORE_BINARY_OP(<=, std::less_equal<>())
KARI_HPP_DEFINE_UNDERSCORE_BINARY_OP(>=, std::greater_equal<>())
KARI_HPP_DEFINE_UNDERSCORE_BINARY_OP(==, std::equal_to<>())
KARI_HPP_DEFINE_UNDERSCORE_BINARY_OP(!=, std::not_equal_to<>())
KARI_HPP_DEFINE_UNDERSCORE_BINARY_OP(| , std::bit_or<>())
KARI_HPP_DEFINE_UNDERSCORE_BINARY_OP(& , std::bit_and<>())
KARI_HPP_DEFINE_UNDERSCORE_BINARY_OP(^ , std::bit_xor<>())
KARI_HPP_DEFINE_UNDERSCORE_BINARY_OP(||, std::logical_or<>())
KARI_HPP_DEFINE_UNDERSCORE_BINARY_OP(&&, std::logical_and<>())
#undef KARI_HPP_DEFINE_UNDERSCORE_BINARY_OP
}

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/*******************************************************************************
* This file is part of the "https://github.com/BlackMATov/kari.hpp"
* For conditions of distribution and use, see copyright notice in LICENSE.md
* Copyright (C) 2017-2020, by Matvey Cherevko (blackmatov@gmail.com)
******************************************************************************/
#include <kari.hpp/kari.hpp>
#include "doctest/doctest.hpp"
#include <algorithm>
#include <numeric>
#include <vector>
TEST_CASE("kari_examples") {
SUBCASE("Basic currying") {
using namespace kari_hpp;
auto foo = [](int a, int b, int c){
return a + b + c;
};
auto c0 = curry(foo); // currying of `foo` function
auto c1 = c0(10); // apply to first argument
auto c2 = c1(20); // apply to second argument
auto rr = c2(12); // apply to third argument and call the `foo` function
REQUIRE(rr == 42);
}
SUBCASE("Partial application") {
using namespace kari_hpp;
curry_t c0 = [](int v1, int v2, int v3, int v4) {
return v1 + v2 + v3 + v4;
};
auto c1 = c0(15, 20); // partial application of two arguments
auto rr = c1(2, 5); // partial application and call `(15,20,2,5)`
REQUIRE(rr == 42);
}
SUBCASE("Calling nested curried functions") {
using namespace kari_hpp;
curry_t boo = [](int a, int b) {
return a + b;
};
curry_t foo = [boo](int a, int b) {
return boo(a + b);
};
auto c0 = foo(38,3,1);
auto c1 = foo(38,3)(1);
auto c2 = foo(38)(3,1);
REQUIRE(c0 == 42);
REQUIRE(c1 == 42);
REQUIRE(c2 == 42);
}
SUBCASE("Binding member functions and member objects") {
using namespace kari_hpp;
struct foo_t {
int v = 40;
int add_v(int add) {
v += add;
return v;
}
} foo;
auto c0 = curry(&foo_t::add_v);
auto c1 = curry(&foo_t::v);
auto r0 = c0(std::ref(foo))(2);
auto r1 = c1(std::cref(foo));
REQUIRE(r0 == 42);
REQUIRE(r1 == 42);
}
SUBCASE("API/is_curried") {
using namespace kari_hpp;
constexpr auto l = [](int a, int b){
return a + b;
};
constexpr curry_t c = l;
STATIC_REQUIRE(is_curried_v<decltype(c)>);
STATIC_REQUIRE(is_curried<decltype(c)>::value);
}
SUBCASE("Section of operators") {
using namespace kari_hpp::ext::underscore;
std::vector v{1, 2, 3, 4};
REQUIRE(std::accumulate(v.begin(), v.end(), 0, _ + _) == 10);
std::transform(v.begin(), v.end(), v.begin(), _ * 2);
REQUIRE(v == std::vector{2, 4, 6, 8});
std::transform(v.begin(), v.end(), v.begin(), - _);
REQUIRE(v == std::vector{-2, -4, -6, -8});
}
SUBCASE("Pipe operator") {
using namespace kari_hpp::ext;
using namespace kari_hpp::ext::underscore;
constexpr auto r0 = (_*2) | (_+2) | 4; // (4 * 2) + 2 = 10
constexpr auto r1 = 4 | (_*2) | (_+2); // (4 * 2 + 2) = 10
STATIC_REQUIRE(r0 == 10);
STATIC_REQUIRE(r1 == 10);
}
SUBCASE("Compose operator") {
using namespace kari_hpp::ext;
using namespace kari_hpp::ext::underscore;
constexpr auto r0 = (_*2) * (_+2) * 4; // (4 + 2) * 2 = 12
constexpr auto r1 = 4 * (_*2) * (_+2); // (4 * 2 + 2) = 10
STATIC_REQUIRE(r0 == 12);
STATIC_REQUIRE(r1 == 10);
}
SUBCASE("Point-free style") {
using namespace kari_hpp::ext;
using namespace kari_hpp::ext::underscore;
// (. (+2)) (*2) $ 10 == 24 // haskell analog
constexpr auto r0 = (_*(_+2))(_*2) * 10;
// ((+2) .) (*2) $ 10 == 22 // haskell analog
constexpr auto r1 = ((_+2)*_)(_*2) * 10;
STATIC_REQUIRE(r0 == 24);
STATIC_REQUIRE(r1 == 22);
}
}

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/*******************************************************************************
* This file is part of the "https://github.com/BlackMATov/kari.hpp"
* For conditions of distribution and use, see copyright notice in LICENSE.md
* Copyright (C) 2017-2020, by Matvey Cherevko (blackmatov@gmail.com)
******************************************************************************/
#include <kari.hpp/kari.hpp>
#include "doctest/doctest.hpp"
using namespace kari_hpp;
using namespace kari_hpp::ext;
TEST_CASE("kari_ext") {
struct box final {
int v;
constexpr box(int v): v(v) {}
};
SUBCASE("fid") {
STATIC_REQUIRE(fid(box(10)).v == 10);
}
SUBCASE("fconst") {
STATIC_REQUIRE(fconst(box(10), 20).v == 10);
{
constexpr auto f = fconst(box(10));
STATIC_REQUIRE(f(20).v == 10);
}
}
SUBCASE("fflip") {
using namespace underscore;
STATIC_REQUIRE(fflip(_ - _)(10, 20) == 10);
}
SUBCASE("fpipe") {
using namespace underscore;
STATIC_REQUIRE(fpipe(_+2, _*2, 4) == 12);
STATIC_REQUIRE(((_+2) | (_*2) | 4) == 12);
STATIC_REQUIRE((4 | (_+2) | (_*2)) == 12);
}
SUBCASE("fcompose") {
using namespace underscore;
STATIC_REQUIRE(fcompose(_+2, _*2, 4) == 10);
STATIC_REQUIRE((_+2) * (_*2) * 4 == 10);
STATIC_REQUIRE(4 * (_+2) * (_*2) == 12);
{
constexpr auto s3 = [](int v1, int v2, int v3){
return v1 + v2 + v3;
};
constexpr auto c = curry(s3) * (_*2) * 10 * 20 * 30;
STATIC_REQUIRE(c == 70);
}
{
// (. (+2)) (*2) $ 10 == 24
constexpr int i = fflip(fcompose)(_+2, _*2, 10);
constexpr int j = (_*(_+2))(_*2)(10);
STATIC_REQUIRE(i == 24);
STATIC_REQUIRE(j == 24);
}
{
// ((+2) .) (*2) $ 10 == 24
constexpr int i = fcompose(_+2)(_*2, 10);
constexpr int j = ((_+2) * _)(_*2)(10);
STATIC_REQUIRE(i == 22);
STATIC_REQUIRE(j == 22);
}
}
SUBCASE("underscore") {
using namespace underscore;
STATIC_REQUIRE((-_)(40) == -40);
STATIC_REQUIRE((_ + 40)(2) == 42);
STATIC_REQUIRE((_ - 2)(44) == 42);
STATIC_REQUIRE((_ * 21)(2) == 42);
STATIC_REQUIRE((_ / 2)(84) == 42);
STATIC_REQUIRE((_ % 100)(142) == 42);
STATIC_REQUIRE((_ == 42)(42));
STATIC_REQUIRE((_ != 42)(40));
STATIC_REQUIRE_FALSE((_ == 42)(40));
STATIC_REQUIRE_FALSE((_ != 42)(42));
STATIC_REQUIRE((40 + _)(2) == 42);
STATIC_REQUIRE((44 - _)(2) == 42);
STATIC_REQUIRE((21 * _)(2) == 42);
STATIC_REQUIRE((84 / _)(2) == 42);
STATIC_REQUIRE((142 % _)(100) == 42);
STATIC_REQUIRE((42 == _)(42));
STATIC_REQUIRE((42 != _)(40));
STATIC_REQUIRE_FALSE((42 == _)(40));
STATIC_REQUIRE_FALSE((42 != _)(42));
STATIC_REQUIRE((_ + _)(40,2) == 42);
STATIC_REQUIRE((_ - _)(44,2) == 42);
STATIC_REQUIRE((_ * _)(21,2) == 42);
STATIC_REQUIRE((_ / _)(84,2) == 42);
STATIC_REQUIRE((_ % _)(142,100) == 42);
STATIC_REQUIRE((_ == _)(42,42));
STATIC_REQUIRE((_ != _)(42,40));
STATIC_REQUIRE_FALSE((_ == _)(42,40));
STATIC_REQUIRE_FALSE((_ != _)(42,42));
}
}

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