Created
July 25, 2010 15:48
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Reverse a list of string in C++
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#include <iostream> | |
#include <vector> | |
#include <algorithm> | |
#include <string> | |
// Reverse the elements in a vector. | |
template <typename T> | |
std::vector<T> Reverse(std::vector<T> input) | |
{ | |
std::vector<T> output; | |
std::copy(input.rbegin(), input.rend(), std::back_inserter(output)); | |
return output; | |
} | |
// Validate that two collections have the contents. | |
template <typename ExpectedIteratorType, typename ActualIteratorType> | |
void ValidateListsHaveTheSameElements(ExpectedIteratorType expectedBegin, ExpectedIteratorType expectedEnd, ActualIteratorType actualBegin, ActualIteratorType actualEnd) | |
{ | |
size_t numberOfExpected = std::distance(expectedBegin, expectedEnd); | |
size_t numberOfActual = std::distance(actualBegin, actualEnd); | |
if (numberOfExpected != numberOfActual) | |
{ | |
std::cout << "Difference found - The number of expected elements is " << numberOfExpected << " the number of actual elements is " << numberOfActual << std::endl; | |
} | |
ExpectedIteratorType expected = expectedBegin; | |
ActualIteratorType actual = actualBegin; | |
for (; expected != expectedEnd && actual != actualEnd; ++expected, ++actual) | |
{ | |
if (*expected != *actual) | |
{ | |
std::cout << "Difference found - expected: " << *expected << " actual: " << *actual << std::endl; | |
break; | |
} | |
} | |
} | |
void main() | |
{ | |
std::vector<std::string> input; | |
input.push_back("The"); | |
input.push_back("quick"); | |
input.push_back("brown"); | |
input.push_back("fox"); | |
std::vector<std::string> actual = Reverse(input); | |
std::string expected[] = { "fox", "brown", "quick", "The" }; | |
ValidateListsHaveTheSameElements(&expected[0], &expected[4], actual.begin(), actual.end()); | |
} |
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