Replace std::tuple with custom tuple

CMakeLists.txt

@@ -4,17 +4,10 @@ project(
   VERSION 0.3.0
   LANGUAGES CXX)
 
-# check if the project is top-level
-if(CMAKE_PROJECT_NAME STREQUAL PROJECT_NAME)
-  set(GPU_ARRAY_IS_TOPLEVEL_PROJECT ON)
-else()
-  set(GPU_ARRAY_IS_TOPLEVEL_PROJECT OFF)
-endif()
-
 # options
 option(ENABLE_HIP "Enable HIP support" OFF)
 option(GPU_ARRAY_BUILD_TEST "Build ${PROJECT_NAME} tests"
-       ${GPU_ARRAY_IS_TOPLEVEL_PROJECT})
+       ${PROJECT_IS_TOP_LEVEL})
 
 # library
 include(GNUInstallDirs)
@@ -30,7 +23,7 @@ target_include_directories(
 set_target_properties(${PROJECT_NAME} PROPERTIES VERSION ${PROJECT_VERSION})
 
 # install
-if(GPU_ARRAY_IS_TOPLEVEL_PROJECT)
+if(PROJECT_IS_TOP_LEVEL)
   install(TARGETS ${PROJECT_NAME} EXPORT ${PROJECT_NAME}_Targets)
 
   install(

README.md

@@ -186,21 +186,20 @@ gpu-array supports both Array of structures (AoS) and Structure of arrays (SoA)
 
 ```cpp
 #include <gpu_array.hpp>
-#include <tuple>
 #include <vector>
 
 using namespace gpu_array;
 
-// std::tuple or its derived struct can be used as structure type
+// gpu_array::tuple (or std::tuple) or its derived struct can be used as structure type
 // The below example shows a tuple-derived struct with three members and their accessors
 template <typename... Ts>
 requires (sizeof...(Ts) == 3)
-struct CustomTuple : public std::tuple<Ts...>
+struct CustomTuple : public tuple<Ts...>
 {
-    using std::tuple<Ts...>::tuple;
-    __host__ __device__ auto& get_a() { return std::get<0>(*this); }
-    __host__ __device__ auto& get_b() { return std::get<1>(*this); }
-    __host__ __device__ auto& get_c() { return std::get<2>(*this); }
+    using tuple<Ts...>::tuple;
+    __host__ __device__ auto& get_a() { return get<0>(*this); }
+    __host__ __device__ auto& get_b() { return get<1>(*this); }
+    __host__ __device__ auto& get_c() { return get<2>(*this); }
 };
 using Struct = CustomTuple<int, float, double>;