[libc++][functional] Implement `std::bind_front<NTTP>` #165096

JMazurkiewicz · 2025-10-25T13:18:50Z

Add std::bind_front<NTTP> function from P2714R1.

Previous PR (std::not_fn<NTTP>): #86133. Towards #105388.

llvmbot · 2025-10-25T13:19:32Z

@llvm/pr-subscribers-libcxx

Author: Jakub Mazurkiewicz (JMazurkiewicz)

Changes

Add std::bind_front<NTTP> function from P2714R1.

Previous PR (std::not_fn<NTTP>): #86133. Towards #105388.

Full diff: https://github.com/llvm/llvm-project/pull/165096.diff

6 Files Affected:

(modified) libcxx/include/__functional/bind_front.h (+34)
(modified) libcxx/include/functional (+2)
(added) libcxx/test/libcxx/utilities/function.objects/func.bind.partial/bind_front.nttp.nodiscard.verify.cpp (+19)
(added) libcxx/test/std/utilities/function.objects/func.bind.partial/bind_front.nttp.pass.cpp (+355)
(added) libcxx/test/std/utilities/function.objects/func.bind.partial/bind_front.nttp.verify.cpp (+64)
(modified) libcxx/test/std/utilities/function.objects/func.bind.partial/types.h (+5)

diff --git a/libcxx/include/__functional/bind_front.h b/libcxx/include/__functional/bind_front.h
index 87ef3affe80b6..1813209720cf9 100644
--- a/libcxx/include/__functional/bind_front.h
+++ b/libcxx/include/__functional/bind_front.h
@@ -17,6 +17,8 @@
 #include <__type_traits/decay.h>
 #include <__type_traits/enable_if.h>
 #include <__type_traits/is_constructible.h>
+#include <__type_traits/is_member_pointer.h>
+#include <__type_traits/is_pointer.h>
 #include <__utility/forward.h>
 
 #if !defined(_LIBCPP_HAS_NO_PRAGMA_SYSTEM_HEADER)
@@ -49,6 +51,38 @@ _LIBCPP_HIDE_FROM_ABI constexpr auto bind_front(_Fn&& __f, _Args&&... __args) {
 
 #endif // _LIBCPP_STD_VER >= 20
 
+#if _LIBCPP_STD_VER >= 26
+
+template <auto _Fn>
+struct __nttp_bind_front_op {
+  template <class... _Args>
+  _LIBCPP_HIDE_FROM_ABI constexpr auto operator()(_Args&&... __args) const
+      noexcept(noexcept(std::invoke(_Fn, std::forward<_Args>(__args)...)))
+          -> decltype(std::invoke(_Fn, std::forward<_Args>(__args)...)) {
+    return std::invoke(_Fn, std::forward<_Args>(__args)...);
+  }
+};
+
+template <auto _Fn, class... _BoundArgs>
+struct __nttp_bind_front_t : __perfect_forward<__nttp_bind_front_op<_Fn>, _BoundArgs...> {
+  using __perfect_forward<__nttp_bind_front_op<_Fn>, _BoundArgs...>::__perfect_forward;
+};
+
+template <auto _Fn, class... _Args>
+[[nodiscard]] _LIBCPP_HIDE_FROM_ABI constexpr auto bind_front(_Args&&... __args) {
+  static_assert((is_constructible_v<decay_t<_Args>, _Args> && ...),
+                "bind_front requires all decay_t<Args> to be constructible from respective Args");
+  static_assert((is_move_constructible_v<decay_t<_Args>> && ...),
+                "bind_front requires all decay_t<Args> to be move constructible");
+  if constexpr (using _Ty = decltype(_Fn); is_pointer_v<_Ty> || is_member_pointer_v<_Ty>) {
+    static_assert(_Fn != nullptr, "f cannot be equal to nullptr");
+  }
+
+  return __nttp_bind_front_t<_Fn, decay_t<_Args>...>(std::forward<_Args>(__args)...);
+}
+
+#endif // _LIBCPP_STD_VER >= 26
+
 _LIBCPP_END_NAMESPACE_STD
 
 #endif // _LIBCPP___FUNCTIONAL_BIND_FRONT_H
diff --git a/libcxx/include/functional b/libcxx/include/functional
index 9ebcd818ec840..020754a96432c 100644
--- a/libcxx/include/functional
+++ b/libcxx/include/functional
@@ -221,6 +221,8 @@ template <auto f>
 // [func.bind.partial], function templates bind_front and bind_back
 template<class F, class... Args>
   constexpr unspecified bind_front(F&&, Args&&...); // C++20
+template<auto f, class... Args>
+  constexpr unspecified bind_front(Args&&...);      // C++26
 template<class F, class... Args>
   constexpr unspecified bind_back(F&&, Args&&...);  // C++23
 
diff --git a/libcxx/test/libcxx/utilities/function.objects/func.bind.partial/bind_front.nttp.nodiscard.verify.cpp b/libcxx/test/libcxx/utilities/function.objects/func.bind.partial/bind_front.nttp.nodiscard.verify.cpp
new file mode 100644
index 0000000000000..3fcee5b9a2bad
--- /dev/null
+++ b/libcxx/test/libcxx/utilities/function.objects/func.bind.partial/bind_front.nttp.nodiscard.verify.cpp
@@ -0,0 +1,19 @@
+//===----------------------------------------------------------------------===//
+//
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
+//
+//===----------------------------------------------------------------------===//
+
+// REQUIRES: std-at-least-c++26
+
+// <functional>
+
+// Test the libc++ extension that std::bind_front<NTTP> is marked as [[nodiscard]].
+
+#include <functional>
+
+void test() {
+  std::bind_front<test>(); // expected-warning {{ignoring return value of function declared with 'nodiscard' attribute}}
+}
diff --git a/libcxx/test/std/utilities/function.objects/func.bind.partial/bind_front.nttp.pass.cpp b/libcxx/test/std/utilities/function.objects/func.bind.partial/bind_front.nttp.pass.cpp
new file mode 100644
index 0000000000000..12c751618bea9
--- /dev/null
+++ b/libcxx/test/std/utilities/function.objects/func.bind.partial/bind_front.nttp.pass.cpp
@@ -0,0 +1,355 @@
+//===----------------------------------------------------------------------===//
+//
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
+//
+//===----------------------------------------------------------------------===//
+
+// REQUIRES: std-at-least-c++26
+
+// <functional>
+
+// template<auto f, class... Args>
+//   constexpr unspecified bind_front(Args&&...);
+
+#include <functional>
+
+#include <cassert>
+#include <concepts>
+#include <tuple>
+#include <type_traits>
+#include <utility>
+
+#include "types.h"
+
+constexpr void test_basic_bindings() {
+  { // Bind arguments, call without arguments
+    {
+      auto f = std::bind_front<MakeTuple{}>();
+      assert(f() == std::make_tuple());
+    }
+    {
+      auto f = std::bind_front<MakeTuple{}>(Elem<1>{});
+      assert(f() == std::make_tuple(Elem<1>{}));
+    }
+    {
+      auto f = std::bind_front<MakeTuple{}>(Elem<1>{}, Elem<2>{});
+      assert(f() == std::make_tuple(Elem<1>{}, Elem<2>{}));
+    }
+    {
+      auto f = std::bind_front<MakeTuple{}>(Elem<1>{}, Elem<2>{}, Elem<3>{});
+      assert(f() == std::make_tuple(Elem<1>{}, Elem<2>{}, Elem<3>{}));
+    }
+  }
+
+  { // Bind no arguments, call with arguments
+    {
+      auto f = std::bind_front<MakeTuple{}>();
+      assert(f(Elem<1>{}) == std::make_tuple(Elem<1>{}));
+    }
+    {
+      auto f = std::bind_front<MakeTuple{}>();
+      assert(f(Elem<1>{}, Elem<2>{}) == std::make_tuple(Elem<1>{}, Elem<2>{}));
+    }
+    {
+      auto f = std::bind_front<MakeTuple{}>();
+      assert(f(Elem<1>{}, Elem<2>{}, Elem<3>{}) == std::make_tuple(Elem<1>{}, Elem<2>{}, Elem<3>{}));
+    }
+  }
+
+  { // Bind arguments, call with arguments
+    {
+      auto f = std::bind_front<MakeTuple{}>(Elem<1>{});
+      assert(f(Elem<10>{}) == std::make_tuple(Elem<1>{}, Elem<10>{}));
+    }
+    {
+      auto f = std::bind_front<MakeTuple{}>(Elem<1>{}, Elem<2>{});
+      assert(f(Elem<10>{}) == std::make_tuple(Elem<1>{}, Elem<2>{}, Elem<10>{}));
+    }
+    {
+      auto f = std::bind_front<MakeTuple{}>(Elem<1>{}, Elem<2>{}, Elem<3>{});
+      assert(f(Elem<10>{}) == std::make_tuple(Elem<1>{}, Elem<2>{}, Elem<3>{}, Elem<10>{}));
+    }
+
+    {
+      auto f = std::bind_front<MakeTuple{}>(Elem<1>{});
+      assert(f(Elem<10>{}, Elem<11>{}) == std::make_tuple(Elem<1>{}, Elem<10>{}, Elem<11>{}));
+    }
+    {
+      auto f = std::bind_front<MakeTuple{}>(Elem<1>{}, Elem<2>{});
+      assert(f(Elem<10>{}, Elem<11>{}) == std::make_tuple(Elem<1>{}, Elem<2>{}, Elem<10>{}, Elem<11>{}));
+    }
+    {
+      auto f = std::bind_front<MakeTuple{}>(Elem<1>{}, Elem<2>{}, Elem<3>{});
+      assert(f(Elem<10>{}, Elem<11>{}) == std::make_tuple(Elem<1>{}, Elem<2>{}, Elem<3>{}, Elem<10>{}, Elem<11>{}));
+    }
+    {
+      auto f = std::bind_front<MakeTuple{}>(Elem<1>{}, Elem<2>{}, Elem<3>{});
+      assert(f(Elem<10>{}, Elem<11>{}, Elem<12>{}) ==
+             std::make_tuple(Elem<1>{}, Elem<2>{}, Elem<3>{}, Elem<10>{}, Elem<11>{}, Elem<12>{}));
+    }
+  }
+
+  { // Basic tests with fundamental types
+    const int n = 2;
+    const int m = 1;
+    int o       = 0;
+
+    auto add       = [](int x, int y) { return x + y; };
+    auto add6      = [](int a, int b, int c, int d, int e, int f) { return a + b + c + d + e + f; };
+    auto increment = [](int& x) { return ++x; };
+
+    auto a = std::bind_front<add>(m, n);
+    assert(a() == 3);
+
+    auto b = std::bind_front<add6>(m, n, m, m, m, m);
+    assert(b() == 7);
+
+    auto c = std::bind_front<add6>(n, m);
+    assert(c(1, 1, 1, 1) == 7);
+
+    auto f = std::bind_front<add>(n);
+    assert(f(3) == 5);
+
+    auto g = std::bind_front<add>(n, 1);
+    assert(g() == 3);
+
+    auto h = std::bind_front<add6>(1, 1, 1);
+    assert(h(2, 2, 2) == 9);
+
+    auto i = std::bind_front<increment>();
+    assert(i(o) == 1);
+    assert(o == 1);
+
+    auto j = std::bind_front<increment>(std::ref(o));
+    assert(j() == 2);
+    assert(o == 2);
+  }
+}
+
+constexpr void test_edge_cases() {
+  { // Make sure we don't treat std::reference_wrapper specially.
+    auto sub = [](std::reference_wrapper<int> a, std::reference_wrapper<int> b) { return a.get() - b.get(); };
+
+    int i  = 1;
+    int j  = 2;
+    auto f = std::bind_front<sub>(std::ref(i));
+    assert(f(std::ref(j)) == -1);
+  }
+
+  { // Make sure we can call a function that's a pointer to a member function.
+    struct MemberFunction {
+      constexpr int mul(int x, int y) { return x * y; }
+    };
+
+    MemberFunction value;
+    auto fn = std::bind_front<&MemberFunction::mul>(value, 2);
+    assert(fn(3) == 6);
+  }
+
+  { // Make sure we can call a function that's a pointer to a member object.
+    struct MemberObject {
+      int obj;
+    };
+
+    MemberObject value{.obj = 3};
+    auto fn1 = std::bind_front<&MemberObject::obj>();
+    assert(fn1(value) == 3);
+    auto fn2 = std::bind_front<&MemberObject::obj>(value);
+    assert(fn2() == 3);
+  }
+}
+
+constexpr void test_passing_arguments() {
+  { // Make sure that we copy the bound arguments into the unspecified-type.
+    int n  = 2;
+    auto f = std::bind_front<[](int x, int y) { return x + y; }>(n, 1);
+    n      = 100;
+    assert(f() == 3);
+  }
+
+  { // Make sure we pass the bound arguments to the function object
+    // with the right value category.
+    {
+      auto was_copied = [](CopyMoveInfo info) { return info.copy_kind == CopyMoveInfo::copy; };
+      CopyMoveInfo info;
+      auto f = std::bind_front<was_copied>(info);
+      assert(f());
+    }
+
+    {
+      auto was_moved = [](CopyMoveInfo info) { return info.copy_kind == CopyMoveInfo::move; };
+      CopyMoveInfo info;
+      auto f = std::bind_front<was_moved>(info);
+      assert(std::move(f)());
+    }
+  }
+}
+
+constexpr void test_perfect_forwarding_call_wrapper() {
+  { // Make sure we call the correctly cv-ref qualified operator()
+    // based on the value category of the bind_front<NTTP> unspecified-type.
+    struct X {
+      constexpr int operator()() & { return 1; }
+      constexpr int operator()() const& { return 2; }
+      constexpr int operator()() && { return 3; }
+      constexpr int operator()() const&& { return 4; }
+    };
+
+    auto f  = std::bind_front<X{}>();
+    using F = decltype(f);
+    assert(static_cast<F&>(f)() == 2);
+    assert(static_cast<const F&>(f)() == 2);
+    assert(static_cast<F&&>(f)() == 2);
+    assert(static_cast<const F&&>(f)() == 2);
+  }
+
+  // Call to `bind_front<NTTP>` unspecified-type's operator() should always result in call to the const& overload of the underlying function object.
+  {
+    { // Make sure unspecified-type is still callable when we delete the & overload.
+      struct X {
+        int operator()() & = delete;
+        int operator()() const&;
+        int operator()() &&;
+        int operator()() const&&;
+      };
+
+      using F = decltype(std::bind_front<X{}>());
+      static_assert(std::invocable<F&>);
+      static_assert(std::invocable<const F&>);
+      static_assert(std::invocable<F>);
+      static_assert(std::invocable<const F>);
+    }
+
+    { // Make sure unspecified-type is not callable when we delete the const& overload.
+      struct X {
+        int operator()() &;
+        int operator()() const& = delete;
+        int operator()() &&;
+        int operator()() const&&;
+      };
+
+      using F = decltype(std::bind_front<X{}>());
+      static_assert(!std::invocable<F&>);
+      static_assert(!std::invocable<const F&>);
+      static_assert(!std::invocable<F>);
+      static_assert(!std::invocable<const F>);
+    }
+
+    { // Make sure unspecified-type is still callable when we delete the && overload.
+      struct X {
+        int operator()() &;
+        int operator()() const&;
+        int operator()() && = delete;
+        int operator()() const&&;
+      };
+
+      using F = decltype(std::bind_front<X{}>());
+      static_assert(std::invocable<F&>);
+      static_assert(std::invocable<const F&>);
+      static_assert(std::invocable<F>);
+      static_assert(std::invocable<const F>);
+    }
+
+    { // Make sure unspecified-type is still callable when we delete the const&& overload.
+      struct X {
+        int operator()() &;
+        int operator()() const&;
+        int operator()() &&;
+        int operator()() const&& = delete;
+      };
+
+      using F = decltype(std::bind_front<X{}>());
+      static_assert(std::invocable<F&>);
+      static_assert(std::invocable<const F&>);
+      static_assert(std::invocable<F>);
+      static_assert(std::invocable<const F>);
+    }
+  }
+
+  { // Test perfect forwarding
+    auto f = [](int& val) {
+      val = 5;
+      return 10;
+    };
+
+    auto bf = std::bind_front<f>();
+    int val = 0;
+    assert(bf(val) == 10);
+    assert(val == 5);
+
+    using BF = decltype(bf);
+    static_assert(std::invocable<BF, int&>);
+    static_assert(!std::invocable<BF, int>);
+  }
+}
+
+constexpr void test_return_type() {
+  { // Test constructors and assignment operators
+    struct LeftShift {
+      constexpr unsigned int operator()(unsigned int x, unsigned int y) const { return x << y; }
+    };
+
+    auto power_of_2 = std::bind_front<LeftShift{}>(1);
+    assert(power_of_2(5) == 32U);
+    assert(power_of_2(4) == 16U);
+
+    auto moved = std::move(power_of_2);
+    assert(moved(6) == 64);
+    assert(moved(7) == 128);
+
+    auto copied = power_of_2;
+    assert(copied(3) == 8);
+    assert(copied(2) == 4);
+
+    moved = std::move(copied);
+    assert(copied(1) == 2);
+    assert(copied(0) == 1);
+
+    copied = moved;
+    assert(copied(8) == 256);
+    assert(copied(9) == 512);
+  }
+
+  { // Make sure `bind_front<NTTP>` unspecified-type's operator() is SFINAE-friendly.
+    using F = decltype(std::bind_front<[](int x, int y) { return x / y; }>(1));
+    static_assert(!std::is_invocable<F>::value);
+    static_assert(std::is_invocable<F, int>::value);
+    static_assert(!std::is_invocable<F, void*>::value);
+    static_assert(!std::is_invocable<F, int, int>::value);
+  }
+
+  { // Test noexceptness
+    auto always_noexcept = std::bind_front<MaybeNoexceptFn<true>{}>();
+    static_assert(noexcept(always_noexcept()));
+
+    auto never_noexcept = std::bind_front<MaybeNoexceptFn<false>{}>();
+    static_assert(!noexcept(never_noexcept()));
+  }
+
+  { // Test calling volatile wrapper
+    using Fn = decltype(std::bind_front<std::integral_constant<int, 0>{}>());
+    static_assert(!std::invocable<volatile Fn&>);
+    static_assert(!std::invocable<const volatile Fn&>);
+    static_assert(!std::invocable<volatile Fn>);
+    static_assert(!std::invocable<const volatile Fn>);
+  }
+}
+
+constexpr bool test() {
+  test_basic_bindings();
+  test_edge_cases();
+  test_passing_arguments();
+  test_perfect_forwarding_call_wrapper();
+  test_return_type();
+
+  return true;
+}
+
+int main(int, char**) {
+  test();
+  static_assert((test(), true));
+
+  return 0;
+}
diff --git a/libcxx/test/std/utilities/function.objects/func.bind.partial/bind_front.nttp.verify.cpp b/libcxx/test/std/utilities/function.objects/func.bind.partial/bind_front.nttp.verify.cpp
new file mode 100644
index 0000000000000..9bdf7797aafeb
--- /dev/null
+++ b/libcxx/test/std/utilities/function.objects/func.bind.partial/bind_front.nttp.verify.cpp
@@ -0,0 +1,64 @@
+//===----------------------------------------------------------------------===//
+//
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
+//
+//===----------------------------------------------------------------------===//
+
+// REQUIRES: std-at-least-c++26
+
+// <functional>
+
+// template<auto f, class... Args>
+//   constexpr unspecified bind_front(Args&&...);
+// Mandates:
+// - (is_constructible_v<BoundArgs, Args> && ...) is true, and
+// - (is_move_constructible_v<BoundArgs> && ...) is true, and
+// - If is_pointer_v<F> || is_member_pointer_v<F> is true, then f != nullptr is true.
+
+#include <functional>
+
+struct AnyArgs {
+  template <class... Args>
+  void operator()(Args&&...) {}
+};
+
+void test() {
+  { // (is_constructible_v<BoundArgs, Args> && ...) is true
+    struct Arg {
+      Arg()           = default;
+      Arg(const Arg&) = default;
+      Arg(Arg&)       = delete;
+    };
+
+    Arg arg;
+    auto _ = std::bind_front<AnyArgs{}>(arg);
+    // expected-error@*:* {{static assertion failed due to requirement 'is_constructible_v<Arg, Arg &>': bind_front requires all decay_t<Args> to be constructible from respective Args}}
+  }
+
+  { // (is_move_constructible_v<BoundArgs> && ...) is true
+    struct Arg {
+      Arg()           = default;
+      Arg(Arg&&)      = delete;
+      Arg(const Arg&) = default;
+    };
+
+    Arg arg;
+    auto _ = std::bind_front<AnyArgs{}>(arg);
+    // expected-error@*:* {{static assertion failed due to requirement 'is_move_constructible_v<Arg>': bind_front requires all decay_t<Args> to be move constructible}}
+  }
+
+  { // If is_pointer_v<F> || is_member_pointer_v<F> is true, then f != nullptr is true
+    struct X {};
+
+    auto _ = std::bind_front<static_cast<void (*)()>(nullptr)>();
+    // expected-error@*:* {{static assertion failed due to requirement 'nullptr != nullptr': f cannot be equal to nullptr}}
+
+    auto _ = std::bind_front<static_cast<int X::*>(nullptr)>();
+    // expected-error@*:* {{static assertion failed due to requirement 'nullptr != nullptr': f cannot be equal to nullptr}}
+
+    auto _ = std::bind_front<static_cast<void (X::*)()>(nullptr)>();
+    // expected-error@*:* {{static assertion failed due to requirement 'nullptr != nullptr': f cannot be equal to nullptr}}
+  }
+}
diff --git a/libcxx/test/std/utilities/function.objects/func.bind.partial/types.h b/libcxx/test/std/utilities/function.objects/func.bind.partial/types.h
index 76ed4d478baac..98277e6231895 100644
--- a/libcxx/test/std/utilities/function.objects/func.bind.partial/types.h
+++ b/libcxx/test/std/utilities/function.objects/func.bind.partial/types.h
@@ -40,4 +40,9 @@ T do_nothing(T t) {
   return t;
 }
 
+template <bool IsNoexcept>
+struct MaybeNoexceptFn {
+  bool operator()() const noexcept(IsNoexcept); // not defined
+};
+
 #endif // TEST_STD_UTILITIES_FUNCTION_OBJECTS_FUNC_BIND_PARTIAL_TYPES_H

frederick-vs-ja · 2025-10-26T08:47:16Z

libcxx/include/__functional/bind_front.h

+
+template <auto _Fn, class... _BoundArgs>
+struct __nttp_bind_front_t : __perfect_forward<__nttp_bind_front_op<_Fn>, _BoundArgs...> {
+  using __perfect_forward<__nttp_bind_front_op<_Fn>, _BoundArgs...>::__perfect_forward;


We should be able to use explicit this parameters.

frederick-vs-ja · 2025-10-26T08:48:36Z

libcxx/include/__functional/bind_front.h

+    static_assert(_Fn != nullptr, "f cannot be equal to nullptr");
+  }
+
+  return __nttp_bind_front_t<_Fn, decay_t<_Args>...>(std::forward<_Args>(__args)...);


When sizeof...(_Args) == 0, it seems better to return a functor with static operator().

frederick-vs-ja · 2025-10-26T08:53:01Z

libcxx/test/std/utilities/function.objects/func.bind.partial/bind_front.nttp.verify.cpp

@@ -0,0 +1,64 @@
+//===----------------------------------------------------------------------===//


No change requested for this file. The test failure said

2025-10-25T13:32:25.4922439Z # .---command stderr------------ 2025-10-25T13:32:25.4923105Z # | error: 'expected-error' diagnostics seen but not expected: 2025-10-25T13:32:25.4924660Z # | File /home/gha/actions-runner/_work/llvm-project/llvm-project/build/generic-cxx26/libcxx/test-suite-install/include/c++/v1/__functional/bind_front.h Line 73: call to deleted constructor of 'Arg' 2025-10-25T13:32:25.4926047Z # | 1 error generated. 2025-10-25T13:32:25.4926371Z # `-----------------------------

But I think we can get rid of deleted overloads if we use explicit this parameters.

JMazurkiewicz added 2 commits October 25, 2025 13:25

[libc++][functional] Implement bind_front<NTTP>

44e4880

[libc++][functional] Test bind_front<NTTP>

0a0f2e2

JMazurkiewicz requested a review from a team as a code owner October 25, 2025 13:18

llvmbot added the libc++ libc++ C++ Standard Library. Not GNU libstdc++. Not libc++abi. label Oct 25, 2025

frederick-vs-ja reviewed Oct 26, 2025

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[libc++][functional] Implement `std::bind_front<NTTP>` #165096

[libc++][functional] Implement `std::bind_front<NTTP>` #165096

JMazurkiewicz commented Oct 25, 2025

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		@@ -0,0 +1,64 @@
		//===----------------------------------------------------------------------===//

[libc++][functional] Implement std::bind_front<NTTP> #165096

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[libc++][functional] Implement std::bind_front<NTTP> #165096

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[libc++][functional] Implement `std::bind_front<NTTP>` #165096

[libc++][functional] Implement `std::bind_front<NTTP>` #165096