diff --git a/thrust/thrust/detail/complex/complex.inl b/thrust/thrust/detail/complex/complex.inl
index 6532f32fc6..3f4c126931 100644
--- a/thrust/thrust/detail/complex/complex.inl
+++ b/thrust/thrust/detail/complex/complex.inl
@@ -1,5 +1,5 @@
 /*
- *  Copyright 2008-2021 NVIDIA Corporation
+ *  Copyright 2008-2024 NVIDIA Corporation
  *  Copyright 2013 Filipe RNC Maia
  *
  *  Licensed under the Apache License, Version 2.0 (the "License");
@@ -26,97 +26,44 @@ THRUST_NAMESPACE_BEGIN
 
 /* --- Constructors --- */
 
-#if THRUST_CPP_DIALECT < 2011
-template <typename T>
-_CCCL_HOST_DEVICE complex<T>::complex()
-{
-  real(T());
-  imag(T());
-}
-#endif
-
 template <typename T>
 _CCCL_HOST_DEVICE complex<T>::complex(const T& re)
-#if THRUST_CPP_DIALECT >= 2011
     // Initialize the storage in the member initializer list using C++ unicorn
     // initialization. This allows `complex<T const>` to work.
     : data{re, T()}
 {}
-#else
-{
-  real(re);
-  imag(T());
-}
-#endif
 
 template <typename T>
 _CCCL_HOST_DEVICE complex<T>::complex(const T& re, const T& im)
-#if THRUST_CPP_DIALECT >= 2011
     // Initialize the storage in the member initializer list using C++ unicorn
     // initialization. This allows `complex<T const>` to work.
     : data{re, im}
 {}
-#else
-{
-  real(re);
-  imag(im);
-}
-#endif
-
-#if THRUST_CPP_DIALECT < 2011
-template <typename T>
-_CCCL_HOST_DEVICE complex<T>::complex(const complex<T>& z)
-{
-  real(z.real());
-  imag(z.imag());
-}
-#endif
 
 template <typename T>
 template <typename U>
 _CCCL_HOST_DEVICE complex<T>::complex(const complex<U>& z)
-#if THRUST_CPP_DIALECT >= 2011
     // Initialize the storage in the member initializer list using C++ unicorn
     // initialization. This allows `complex<T const>` to work.
     // We do a functional-style cast here to suppress conversion warnings.
     : data{T(z.real()), T(z.imag())}
 {}
-#else
-{
-  real(T(z.real()));
-  imag(T(z.imag()));
-}
-#endif
 
 template <typename T>
 _CCCL_HOST THRUST_STD_COMPLEX_DEVICE complex<T>::complex(const std::complex<T>& z)
-#if THRUST_CPP_DIALECT >= 2011
     // Initialize the storage in the member initializer list using C++ unicorn
     // initialization. This allows `complex<T const>` to work.
     : data{THRUST_STD_COMPLEX_REAL(z), THRUST_STD_COMPLEX_IMAG(z)}
 {}
-#else
-{
-  real(THRUST_STD_COMPLEX_REAL(z));
-  imag(THRUST_STD_COMPLEX_IMAG(z));
-}
-#endif
 
 template <typename T>
 template <typename U>
 _CCCL_HOST THRUST_STD_COMPLEX_DEVICE complex<T>::complex(const std::complex<U>& z)
-#if THRUST_CPP_DIALECT >= 2011
     // Initialize the storage in the member initializer list using C++ unicorn
     // initialization. This allows `complex<T const>` to work.
     // We do a functional-style cast here to suppress conversion warnings.
     : data{T(THRUST_STD_COMPLEX_REAL(z)), T(THRUST_STD_COMPLEX_IMAG(z))}
 {}
-#else
-{
-  real(T(THRUST_STD_COMPLEX_REAL(z)));
-  imag(T(THRUST_STD_COMPLEX_IMAG(z)));
-}
-#endif
 
 /* --- Assignment Operators --- */
 
@@ -128,16 +75,6 @@ _CCCL_HOST_DEVICE complex<T>& complex<T>::operator=(const T& re)
   return *this;
 }
 
-#if THRUST_CPP_DIALECT < 2011
-template <typename T>
-_CCCL_HOST_DEVICE complex<T>& complex<T>::operator=(const complex<T>& z)
-{
-  real(z.real());
-  imag(z.imag());
-  return *this;
-}
-#endif
-
 template <typename T>
 template <typename U>
 _CCCL_HOST_DEVICE complex<T>& complex<T>::operator=(const complex<U>& z)