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#ifndef BENCHMARK_GENERATE_INPUT_HPP
#define BENCHMARK_GENERATE_INPUT_HPP
#include <algorithm>
#include <random>
#include <vector>
#include <string>
#include <climits>
#include <cstddef>
static const char Letters[] = {
'0','1','2','3','4',
'5','6','7','8','9',
'A','B','C','D','E','F',
'G','H','I','J','K',
'L','M','N','O','P',
'Q','R','S','T','U',
'V','W','X','Y','Z',
'a','b','c','d','e','f',
'g','h','i','j','k',
'l','m','n','o','p',
'q','r','s','t','u',
'v','w','x','y','z'
};
static const std::size_t LettersSize = sizeof(Letters);
inline std::default_random_engine& getRandomEngine() {
static std::default_random_engine RandEngine(std::random_device{}());
return RandEngine;
}
inline char getRandomChar() {
std::uniform_int_distribution<> LettersDist(0, LettersSize-1);
return Letters[LettersDist(getRandomEngine())];
}
template <class IntT>
inline IntT getRandomInteger(IntT Min = 0,
IntT Max = std::numeric_limits<IntT>::max()) {
std::uniform_int_distribution<IntT> dist(Min, Max);
return dist(getRandomEngine());
}
inline std::string getRandomString(std::size_t Len) {
std::string str(Len, 0);
std::generate_n(str.begin(), Len, &getRandomChar);
return str;
}
template <class IntT>
inline std::vector<IntT> getDuplicateIntegerInputs(size_t N) {
std::vector<IntT> inputs(N, static_cast<IntT>(-1));
return inputs;
}
template <class IntT>
inline std::vector<IntT> getSortedIntegerInputs(size_t N) {
std::vector<IntT> inputs;
for (size_t i=0; i < N; i += 1)
inputs.push_back(i);
return inputs;
}
template <class IntT>
std::vector<IntT> getSortedLargeIntegerInputs(size_t N) {
std::vector<IntT> inputs;
for (size_t i=0; i < N; ++i) {
inputs.push_back(i + N);
}
return inputs;
}
template <class IntT>
std::vector<IntT> getSortedTopBitsIntegerInputs(size_t N) {
std::vector<IntT> inputs = getSortedIntegerInputs<IntT>(N);
for (auto& E : inputs) E <<= ((sizeof(IntT) / 2) * CHAR_BIT);
return inputs;
}
template <class IntT>
inline std::vector<IntT> getReverseSortedIntegerInputs(size_t N) {
std::vector<IntT> inputs;
std::size_t i = N;
while (i > 0) {
--i;
inputs.push_back(i);
}
return inputs;
}
template <class IntT>
std::vector<IntT> getPipeOrganIntegerInputs(size_t N) {
std::vector<IntT> v; v.reserve(N);
for (size_t i = 0; i < N/2; ++i) v.push_back(i);
for (size_t i = N/2; i < N; ++i) v.push_back(N - i);
return v;
}
template <class IntT>
std::vector<IntT> getRandomIntegerInputs(size_t N) {
std::vector<IntT> inputs;
for (size_t i=0; i < N; ++i) {
inputs.push_back(getRandomInteger<IntT>());
}
return inputs;
}
inline std::vector<std::string> getDuplicateStringInputs(size_t N) {
std::vector<std::string> inputs(N, getRandomString(1024));
return inputs;
}
inline std::vector<std::string> getRandomStringInputs(size_t N) {
std::vector<std::string> inputs;
for (size_t i=0; i < N; ++i) {
inputs.push_back(getRandomString(1024));
}
return inputs;
}
inline std::vector<std::string> getSortedStringInputs(size_t N) {
std::vector<std::string> inputs = getRandomStringInputs(N);
std::sort(inputs.begin(), inputs.end());
return inputs;
}
inline std::vector<std::string> getReverseSortedStringInputs(size_t N) {
std::vector<std::string> inputs = getSortedStringInputs(N);
std::reverse(inputs.begin(), inputs.end());
return inputs;
}
inline std::vector<const char*> getRandomCStringInputs(size_t N) {
static std::vector<std::string> inputs = getRandomStringInputs(N);
std::vector<const char*> cinputs;
for (auto const& str : inputs)
cinputs.push_back(str.c_str());
return cinputs;
}
#endif // BENCHMARK_GENERATE_INPUT_HPP
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