(C++) TemplateFunctionExample2

 

Technical facts

 

Operating system(s) or programming environment(s)

• Lubuntu 15.04 (vivid)

IDE(s):

• Qt Creator 3.1.1

Project type:

• Console application

C++ standard:

• C++11

Compiler(s):

• G++ 4.9.2

Libraries used:

• STL: GNU ISO C++ Library, version 4.9.2

 

 

 

 

 

Qt project file: ./CppTemplateFunctionExample2/CppTemplateFunctionExample2.pro

 

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TEMPLATE = app CONFIG += console CONFIG -= app_bundle CONFIG -= qt SOURCES += main.cpp CONFIG(release, debug|release) {   DEFINES += NDEBUG } QMAKE_CXXFLAGS += -std=c++11 -Wall -Wextra -Weffc++ unix {   QMAKE_CXXFLAGS += -Werror } win32 {   INCLUDEPATH += \     ../../Libraries/boost_1_54_0 }

 

 

 

 

 

./CppTemplateFunctionExample2/main.cpp

 

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#include <cassert> #include <cmath> #include <string> struct Data {   Data(const int i, const double d, const std::string& s)     : m_int(i), m_double(d), m_string(s) {}   int m_int;   double m_double;   std::string m_string; }; template <class T> const T& Get(const Data&); template <> const int& Get<int>(const Data& d) { return d.m_int; } template <> const double& Get<double>(const Data& d) { return d.m_double; } template <> const std::string& Get<std::string>(const Data& d) { return d.m_string; } int main() {   const Data d(42,M_PI,"Hello world");   assert( Get<int>(d) == 42);   assert( Get<double>(d) == M_PI);   assert( Get<std::string>(d) == "Hello world"); }