nihilismus's solution to Hello World on the C++ track

Instructions

Test suite

Solution

The classical introductory exercise. Just say "Hello, World!".

"Hello, World!" is the traditional first program for beginning programming in a new language or environment.

The objectives are simple:

Write a function that returns the string "Hello, World!".
Run the test suite and make sure that it succeeds.
Submit your solution and check it at the website.

If everything goes well, you will be ready to fetch your first real exercise.

Getting Started

Make sure you have read the Installing and Running the Tests pages for C++ on exercism.io. This covers the basic information on setting up the development environment expected by the exercises.

Passing the Tests

Get the first test compiling, linking and passing by following the three rules of test-driven development. Create just enough structure by declaring namespaces, functions, classes, etc., to satisfy any compiler errors and get the test to fail. Then write just enough code to get the test to pass. Once you've done that, uncomment the next test by moving the following line past the next test.

#if defined(EXERCISM_RUN_ALL_TESTS)

This may result in compile errors as new constructs may be invoked that you haven't yet declared or defined. Again, fix the compile errors minimally to get a failing test, then change the code minimally to pass the test, refactor your implementation for readability and expressiveness and then go on to the next test.

Try to use standard C++14 facilities in preference to writing your own low-level algorithms or facilities by hand. CppReference is a wiki reference to the C++ language and standard library. If you are new to C++, but have programmed in C, beware of C traps and pitfalls.

Source

This is an exercise to introduce users to using Exercism http://en.wikipedia.org/wiki/%22Hello,_world!%22_program

Submitting Incomplete Solutions

It's possible to submit an incomplete solution so you can see how others have completed the exercise.

hello_world_test.cpp

// Include the header file with the definitions of the functions you create.
#include "hello_world.h"

// Include the test framework.
#include "test/catch.hpp"

// Declares a single test.
TEST_CASE("test_hello")
{
    // Check if your function returns "Hello, World!".
    REQUIRE(hello_world::hello() == "Hello, World!");
}

hello_world.cpp

#include "hello_world.h"

using namespace std;

namespace hello_world {

string hello() {
    return "Hello, World!";
}

}

hello_world.h

#if !defined(HELLO_WORLD_H)
#define HELLO_WORLD_H

#include <string>

namespace hello_world {

std::string hello();

}

#endif

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nihilismus's solution

to Hello World in the C++ Track