79 lines
1.9 KiB
C++
79 lines
1.9 KiB
C++
// Copyright 2017, University of Freiburg,
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// Chair of Algorithms and Data Structures.
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// Authors: Patrick Brosi <brosi@informatik.uni-freiburg.de>
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#ifndef UTIL_MISC_H_
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#define UTIL_MISC_H_
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#include <chrono>
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#define UNUSED(expr) do { (void)(expr); } while (0)
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#define TIME() std::chrono::high_resolution_clock::now()
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#define TOOK(t1, t2) (std::chrono::duration_cast<microseconds>(t2 - t1).count() / 1000.0)
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namespace util {
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// cached first 10 powers of 10
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static int pow10[10] = {
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1, 10, 100, 1000, 10000,
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100000, 1000000, 10000000, 100000000, 1000000000};
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// _____________________________________________________________________________
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inline uint64_t factorial(uint64_t n) {
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if (n == 1) return n;
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return n * factorial(n - 1);
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}
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// _____________________________________________________________________________
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inline uint64_t atoul(const char* p) {
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uint64_t ret = 0;
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while (*p) {
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ret = ret * 10 + (*p++ - '0');
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}
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return ret;
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}
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// _____________________________________________________________________________
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inline float atof(const char* p, uint8_t mn) {
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// this atof implementation works only on "normal" float strings like
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// 56.445 or -345.00, but should be faster than std::atof
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float ret = 0.0;
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bool neg = false;
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if (*p == '-') {
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neg = true;
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p++;
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}
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while (*p >= '0' && *p <= '9') {
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ret = ret * 10.0 + (*p - '0');
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p++;
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}
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if (*p == '.') {
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p++;
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float f = 0;
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uint8_t n = 0;
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for (; n < mn && *p >= '0' && *p <= '9'; n++, p++) {
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f = f * 10.0 + (*p - '0');
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}
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if (n < 11)
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ret += f / pow10[n];
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else
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ret += f / std::pow(10, n);
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}
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if (neg) return -ret;
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return ret;
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}
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// _____________________________________________________________________________
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inline double atof(const char* p) { return atof(p, 38); }
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} // namespace util
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#endif // UTIL_MISC_H_
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