Специализация шаблонного метода в .cpp файле.

Author: gusenov

README.md

@@ -182,6 +182,7 @@
 - [Шаблон класса параметрированный геттером массива](tpl/tpl-with-arr-getter)
 - [Вызов у переданного указателя заданного метода с заданными аргументами](tpl/tpl-proxy)
 - [override метода предка переданного аргументом в шаблонный класс](tpl/tpl-and-override)
+- [Специализация шаблонного метода в .cpp файле](tpl/tpl-method-specialization-cpp)
 
 ## Свертка
 

tpl/tpl-method-specialization-cpp/.gitignore

@@ -0,0 +1,160 @@
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+
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tpl/tpl-method-specialization-cpp/.idea/.gitignore

@@ -0,0 +1,6 @@
+cmake_minimum_required(VERSION 3.25)
+project(TPLMethodSpecializationCPP)
+
+set(CMAKE_CXX_STANDARD 17)
+
+add_executable(${PROJECT_NAME} main.cpp StringUtils.cpp)

tpl/tpl-method-specialization-cpp/.idea/.name

@@ -0,0 +1,57 @@
+//
+// Created by Abbas Gussenov on 13.04.2023.
+//
+
+#include "StringUtils.h"
+
+/*
+template<class TOutputString, class TInputString>
+TOutputString StringUtils::ToString(TInputString const&)
+{
+    if constexpr (std::is_same_v<TOutputString, std::wstring>)
+        return L"std::wstring - base - cpp";
+    else if constexpr (std::is_same_v<TOutputString, std::string>)
+        return "std::string - base - cpp";
+    return {};
+}
+*/
+
+template<>
+std::wstring StringUtils::ToString<std::wstring, std::string>(std::string const& aInputString)
+{
+    return L"std::wstring - spec - cpp";
+}
+
+/*
+template
+std::wstring StringUtils::ToString<std::wstring, std::string>(std::string const&);
+*/
+// Explicit instantiation of 'ToString<std::wstring, std::string>' that occurs after an explicit specialization has no effect
+
+/*
+template
+std::wstring StringUtils::ToString(std::string const&);
+*/
+// Explicit instantiation of 'ToString<std::wstring, std::string>' that occurs after an explicit specialization has no effect
+
+template<>
+std::string StringUtils::ToString<std::string, std::wstring>(std::wstring const& aInputString)
+{
+    return "std::string - spec - cpp";
+}
+
+/*
+template
+std::string StringUtils::ToString<std::string, std::wstring>(std::wstring const&);
+*/
+// Explicit instantiation of 'ToString<std::string, std::wstring>' that occurs after an explicit specialization has no effect
+
+/*
+template
+std::string StringUtils::ToString(std::wstring const&);
+*/
+// Explicit instantiation of 'ToString<std::string, std::wstring>' that occurs after an explicit specialization has no effect
+
+StringUtils::StringUtils()
+{
+}

tpl/tpl-method-specialization-cpp/.idea/misc.xml

@@ -0,0 +1,41 @@
+//
+// Created by Abbas Gussenov on 13.04.2023.
+//
+
+#ifndef TPL_METHOD_SPECIALIZATION_CPP_STRINGUTILS_H
+#define TPL_METHOD_SPECIALIZATION_CPP_STRINGUTILS_H
+
+#include <string>
+
+struct StringUtils
+{
+    StringUtils();
+
+    template<class TOutputString, class TInputString>
+	static TOutputString ToString(TInputString const&);
+
+    /*
+    template<> std::wstring ToString(std:: string const&);
+    template<> std:: string ToString(std::wstring const&);
+    */
+
+    /*
+    template<> std::wstring ToString(std:: string const&)
+    {
+        return L"std::string - spec - h";
+    }
+
+    template<> std:: string ToString(std::wstring const&)
+    {
+        return "std::string - spec - h";
+    }
+    */
+
+};
+
+/*
+template<> std::wstring StringUtils::ToString(std:: string const&);
+template<> std:: string StringUtils::ToString(std::wstring const&);
+*/
+
+#endif //TPL_METHOD_SPECIALIZATION_CPP_STRINGUTILS_H

tpl/tpl-method-specialization-cpp/.idea/modules.xml

@@ -0,0 +1,25 @@
+#include <iostream>
+#include "StringUtils.h"
+
+int main() {
+
+    StringUtils stringUtils;
+
+    auto const stdWStr =
+//        stringUtils.ToString<std::wstring>("Hello, World!")  // Undefined symbols for architecture
+        stringUtils.ToString<std::wstring>(std::string("Hello, World!"))
+//        stringUtils.ToString<std::wstring>({"Hello, World!"})  // No matching member function for call to 'ToString'
+    ;
+    std::wcout << stdWStr;
+
+    std::cout << std::endl;
+
+    auto const stdStr =
+//        stringUtils.ToString<std::string>(L"Hello, World!")  // Undefined symbols for architecture
+        stringUtils.ToString<std::string>(std::wstring(L"Hello, World!"))
+//        stringUtils.ToString<std::string>({L"Hello, World!"})  // No matching member function for call to 'ToString'
+    ;
+    std::cout << stdStr;
+
+    return 0;
+}