triangle: initial commit

cpp/triangle/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()
+
+# Include a test helper header if it exists
+if(EXISTS ${CMAKE_CURRENT_SOURCE_DIR}/require_equal_containers.h)
+    set(test_helper require_equal_containers.h)
+else()
+    set(test_helper "")
+endif()
+
+# Build executable from sources and headers
+add_executable(${exercise} ${file}_test.cpp ${test_helper} ${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/triangle/README.md

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+# Triangle
+
+Write a program that can tell you if a triangle is equilateral, isosceles, or scalene.
+
+The program should raise an error if the triangle cannot exist.
+
+Tests are provided, delete one `skip` at a time.
+
+## Hint
+
+The sum of the lengths of any two sides of a triangle always exceeds the
+length of the third side, a principle known as the _triangle
+inequality_.
+
+## 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
+
+The Ruby Koans triangle project, parts 1 & 2 [view source](http://rubykoans.com)

cpp/triangle/triangle_test.cpp

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+#include "triangle.h"
+#define BOOST_TEST_MAIN
+#include <boost/test/unit_test.hpp>
+#include <stdexcept>
+
+BOOST_AUTO_TEST_CASE(equilateral_triangles_have_equal_sides)
+{
+    BOOST_REQUIRE_EQUAL(triangle::equilateral, triangle::kind(2, 2, 2));
+}
+
+#if defined(EXERCISM_RUN_ALL_TESTS)
+BOOST_AUTO_TEST_CASE(larger_equilateral_triangles_also_have_equal_sides)
+{
+    BOOST_REQUIRE_EQUAL(triangle::equilateral, triangle::kind(10, 10, 10));
+}
+
+BOOST_AUTO_TEST_CASE(isosceles_triangles_have_last_two_sides_equal)
+{
+    BOOST_REQUIRE_EQUAL(triangle::isosceles, triangle::kind(3, 4, 4));
+}
+
+BOOST_AUTO_TEST_CASE(isosceles_triangles_have_first_and_last_sides_equal)
+{
+    BOOST_REQUIRE_EQUAL(triangle::isosceles, triangle::kind(4, 3, 4));
+}
+
+BOOST_AUTO_TEST_CASE(isosceles_triangles_have_first_two_sides_equal)
+{
+    BOOST_REQUIRE_EQUAL(triangle::isosceles, triangle::kind(4, 4, 3));
+}
+
+BOOST_AUTO_TEST_CASE(isosceles_triangles_have_in_fact_exactly_two_sides_equal)
+{
+    BOOST_REQUIRE_EQUAL(triangle::isosceles, triangle::kind(10, 10, 2));
+}
+
+BOOST_AUTO_TEST_CASE(scalene_triangles_have_no_equal_sides)
+{
+    BOOST_REQUIRE_EQUAL(triangle::scalene, triangle::kind(3, 4, 5));
+}
+
+BOOST_AUTO_TEST_CASE(scalene_triangles_have_no_equal_sides_at_a_larger_scale_too)
+{
+    BOOST_REQUIRE_EQUAL(triangle::scalene, triangle::kind(10, 11, 12));
+}
+
+BOOST_AUTO_TEST_CASE(scalene_triangles_have_no_equal_sides_in_descending_order_either)
+{
+    BOOST_REQUIRE_EQUAL(triangle::scalene, triangle::kind(5, 4, 2));
+}
+
+BOOST_AUTO_TEST_CASE(very_small_triangles_are_legal)
+{
+    BOOST_REQUIRE_EQUAL(triangle::scalene, triangle::kind(0.4, 0.6, 0.3));
+}
+
+BOOST_AUTO_TEST_CASE(triangles_with_no_size_are_illegal)
+{
+    BOOST_REQUIRE_THROW(triangle::kind(0, 0, 0), std::domain_error);
+}
+
+BOOST_AUTO_TEST_CASE(triangles_with_negative_sides_are_illegal)
+{
+    BOOST_REQUIRE_THROW(triangle::kind(3, 4, -5), std::domain_error);
+}
+
+BOOST_AUTO_TEST_CASE(triangles_violating_triangle_inequality_are_illegal)
+{
+    BOOST_REQUIRE_THROW(triangle::kind(1, 1, 3), std::domain_error);
+}
+
+BOOST_AUTO_TEST_CASE(medium_triangles_violating_triangle_inequality_are_illegal)
+{
+    BOOST_REQUIRE_THROW(triangle::kind(2, 4, 2), std::domain_error);
+}
+
+BOOST_AUTO_TEST_CASE(larger_triangles_violating_triangle_inequality_are_illegal)
+{
+    BOOST_REQUIRE_THROW(triangle::kind(7, 3, 2), std::domain_error);
+}
+#endif