space_age: initial commit

cpp/space-age/CMakeLists.txt

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+# Get the exercise name from the current directory
+get_filename_component(exercise ${CMAKE_CURRENT_SOURCE_DIR} NAME)
+
+# Basic CMake project
+cmake_minimum_required(VERSION 2.8.11)
+
+# Name the project after the exercise
+project(${exercise} CXX)
+
+# Locate Boost libraries: unit_test_framework, date_time and regex
+set(Boost_USE_STATIC_LIBS ON)
+set(Boost_USE_MULTITHREADED ON)
+set(Boost_USE_STATIC_RUNTIME OFF)
+find_package(Boost 1.55 REQUIRED COMPONENTS unit_test_framework date_time regex)
+
+# Enable C++11 features on gcc/clang
+if("${CMAKE_CXX_COMPILER_ID}" MATCHES "(GNU|Clang)")
+    set(CMAKE_CXX_FLAGS "-std=c++11")
+endif()
+
+# Configure to run all the tests?
+if(${EXERCISM_RUN_ALL_TESTS})
+    add_definitions(-DEXERCISM_RUN_ALL_TESTS)
+endif()
+
+# Get a source filename from the exercise name by replacing -'s with _'s
+string(REPLACE "-" "_" file ${exercise})
+
+# Implementation could be only a header
+if(EXISTS ${CMAKE_CURRENT_SOURCE_DIR}/${file}.cpp)
+    set(exercise_cpp ${file}.cpp)
+else()
+    set(exercise_cpp "")
+endif()
+
+# Build executable from sources and headers
+add_executable(${exercise} ${file}_test.cpp ${exercise_cpp} ${file}.h)
+
+# We need boost includes
+target_include_directories(${exercise} PRIVATE ${Boost_INCLUDE_DIRS})
+
+# We need boost libraries
+target_link_libraries(${exercise} ${Boost_LIBRARIES})
+
+# Tell MSVC not to warn us about unchecked iterators in debug builds
+if(${MSVC})
+    set_target_properties(${exercise} PROPERTIES
+        COMPILE_DEFINITIONS_DEBUG _SCL_SECURE_NO_WARNINGS)
+endif()
+
+# Run the tests on every build
+add_custom_command(TARGET ${exercise} POST_BUILD COMMAND ${exercise})

cpp/space-age/README.md

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+# Space Age
+
+Write a program that, given an age in seconds, calculates how old someone is in terms of a given planet's solar years.
+
+Given an age in seconds, calculate how old someone would be on:
+
+   - Earth: orbital period 365.25 Earth days, or 31557600 seconds
+   - Mercury: orbital period 0.2408467 Earth years
+   - Venus: orbital period 0.61519726 Earth years
+   - Mars: orbital period 1.8808158 Earth years
+   - Jupiter: orbital period 11.862615 Earth years
+   - Saturn: orbital period 29.447498 Earth years
+   - Uranus: orbital period 84.016846 Earth years
+   - Neptune: orbital period 164.79132 Earth years
+
+So if you were told someone were 1,000,000,000 seconds old, you should
+be able to say that they're 31 Earth-years old.
+
+If you're wondering why Pluto didn't make the cut, go watch [this
+youtube video](http://www.youtube.com/watch?v=Z_2gbGXzFbs).
+
+## Getting Started
+
+Make sure you have read the [getting started with C++](http://help.exercism.io/getting-started-with-cpp.html)
+page on the [exercism help site](http://help.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](http://butunclebob.com/ArticleS.UncleBob.TheThreeRulesOfTdd).
+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.
+
+```C++
+#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++11 facilities in preference to writing your own
+low-level algorithms or facilities by hand.  [CppReference](http://en.cppreference.com/)
+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](http://www.slideshare.net/LegalizeAdulthood/c-traps-and-pitfalls-for-c-programmers).
+
+## Source
+
+Partially inspired by Chapter 1 in Chris Pine's online Learn to Program tutorial. [view source](http://pine.fm/LearnToProgram/?Chapter=01)

cpp/space-age/space_age_test.cpp

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+#include "space_age.h"
+#define BOOST_TEST_MAIN
+#include <boost/test/unit_test.hpp>
+#include <cmath>
+
+namespace
+{
+const double accuracy = 0.005;
+}
+
+BOOST_AUTO_TEST_CASE(age_in_seconds)
+{
+    const space_age::space_age age(1000000);
+
+    BOOST_REQUIRE_EQUAL(1000000, age.seconds());
+}
+
+#if defined(EXERCISM_RUN_ALL_TESTS)
+BOOST_AUTO_TEST_CASE(age_in_earth_years)
+{
+    const space_age::space_age age(1000000000);
+
+    BOOST_REQUIRE_LT(std::abs(31.69 - age.on_earth()), accuracy);
+}
+
+BOOST_AUTO_TEST_CASE(age_in_mercury_years)
+{
+    const space_age::space_age age(2134835688);
+
+    BOOST_REQUIRE_LT(std::abs(67.65 - age.on_earth()), accuracy);
+    BOOST_REQUIRE_LT(std::abs(280.88 - age.on_mercury()), accuracy);
+}
+
+BOOST_AUTO_TEST_CASE(age_in_venus_years)
+{
+    const space_age::space_age age(189839836);
+
+    BOOST_REQUIRE_LT(std::abs(6.02- age.on_earth()), accuracy);
+    BOOST_REQUIRE_LT(std::abs(9.78 - age.on_venus()), accuracy);
+}
+
+BOOST_AUTO_TEST_CASE(age_in_mars_years)
+{
+    const space_age::space_age age(2329871239);
+
+    BOOST_REQUIRE_LT(std::abs(73.83 - age.on_earth()), accuracy);
+    BOOST_REQUIRE_LT(std::abs(39.25 - age.on_mars()), accuracy);
+}
+
+BOOST_AUTO_TEST_CASE(age_in_jupiter_years)
+{
+    const space_age::space_age age(901876382);
+
+    BOOST_REQUIRE_LT(std::abs(28.58 - age.on_earth()), accuracy);
+    BOOST_REQUIRE_LT(std::abs(2.41 - age.on_jupiter()), accuracy);
+}
+
+BOOST_AUTO_TEST_CASE(age_in_saturn_years)
+{
+    const space_age::space_age age(3000000000);
+
+    BOOST_REQUIRE_LT(std::abs(95.06 - age.on_earth()), accuracy);
+    BOOST_REQUIRE_LT(std::abs(3.23 - age.on_saturn()), accuracy);
+}
+
+BOOST_AUTO_TEST_CASE(age_in_uranus_years)
+{
+    const space_age::space_age age(3210123456);
+
+    BOOST_REQUIRE_LT(std::abs(101.72 - age.on_earth()), accuracy);
+    BOOST_REQUIRE_LT(std::abs(1.21 - age.on_uranus()), accuracy);
+}
+
+BOOST_AUTO_TEST_CASE(age_in_neptune_year)
+{
+    const space_age::space_age age(8210123456);
+
+    BOOST_REQUIRE_LT(std::abs(260.16 - age.on_earth()), accuracy);
+    BOOST_REQUIRE_LT(std::abs(1.58 - age.on_neptune()), accuracy);
+}
+#endif