trinary: initial commit

cpp/trinary/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/trinary/README.md

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+# Trinary
+
+Write a program that will convert a trinary number, represented as a string (e.g. '102012'), to its decimal equivalent using first principles.
+
+The program should consider strings specifying an invalid trinary as the
+value 0.
+
+Trinary numbers contain three symbols: 0, 1, and 2.
+
+The last place in a trinary number is the 1's place. The second to last
+is the 3's place, the third to last is the 9's place, etc.
+
+```bash
+# "102012"
+    1       0       2       0       1       2    # the number
+1*3^5 + 0*3^4 + 2*3^3 + 0*3^2 + 1*3^1 + 2*3^0    # the value
+  243 +     0 +    54 +     0 +     3 +     2 =  302
+```
+
+If your language provides a method in the standard library to perform the
+conversion, pretend it doesn't exist and implement it yourself.
+
+## Getting Started
+
+Make sure you have read [the C++ page](http://exercism.io/languages/cpp) 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](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
+
+All of Computer Science [view source](http://www.wolframalpha.com/input/?i=binary&a=*C.binary-_*MathWorld-)

cpp/trinary/trinary_test.cpp

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+#include "trinary.h"
+#define BOOST_TEST_MAIN
+#include <boost/test/unit_test.hpp>
+
+BOOST_AUTO_TEST_CASE(_1_yields_decimal_1)
+{
+    BOOST_REQUIRE_EQUAL(1, trinary::to_decimal("1"));
+}
+
+#if defined(EXERCISM_RUN_ALL_TESTS)
+BOOST_AUTO_TEST_CASE(_2_yields_decimal_2)
+{
+    BOOST_REQUIRE_EQUAL(2, trinary::to_decimal("2"));
+}
+
+BOOST_AUTO_TEST_CASE(_10_yields_decimal_3)
+{
+    BOOST_REQUIRE_EQUAL(3, trinary::to_decimal("10"));
+}
+
+BOOST_AUTO_TEST_CASE(_11_yields_decimal_4)
+{
+    BOOST_REQUIRE_EQUAL(4, trinary::to_decimal("11"));
+}
+
+BOOST_AUTO_TEST_CASE(_100_yields_decimal_9)
+{
+    BOOST_REQUIRE_EQUAL(9, trinary::to_decimal("100"));
+}
+
+BOOST_AUTO_TEST_CASE(_112_yields_decimal_14)
+{
+    BOOST_REQUIRE_EQUAL(14, trinary::to_decimal("112"));
+}
+
+BOOST_AUTO_TEST_CASE(_222_yields_decimal_26)
+{
+    BOOST_REQUIRE_EQUAL(26, trinary::to_decimal("222"));
+}
+
+BOOST_AUTO_TEST_CASE(_1122000120_yields_decimal_32091)
+{
+    BOOST_REQUIRE_EQUAL(32091, trinary::to_decimal("1122000120"));
+}
+
+BOOST_AUTO_TEST_CASE(invalid_yields_decimal_0)
+{
+    BOOST_REQUIRE_EQUAL(0, trinary::to_decimal("carrot"));
+}
+#endif