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Added clamp function. Added random generation macros. Added MIN and MAX macros. Added very simple uniform random numbers generator (Park Miller). Updated Chronometer so that any string can be displayed.

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Jérôme 2019-04-29 16:54:41 +02:00
parent b6f1ad5573
commit 8ecc9a2518
1 changed files with 35 additions and 3 deletions
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38
utils.hpp
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@ -11,12 +11,41 @@
std::cout << "\n";} std::cout << "\n";}
#define PRINT_STR(x) std::cout << (x) << "\n" #define PRINT_STR(x) std::cout << (x) << "\n"
#define RAND_A_B(a, b) ((double(rand())/RAND_MAX)*(b-a) + a)
#define RAND_0_1() (double(rand())/RAND_MAX)
#define MIN(a, b) ((a) < (b)) ? (a) : (b)
#define MAX(a, b) ((a) > (b)) ? (a) : (b)
template<typename T, typename T2> auto min(const T & a, const T2 & b) -> decltype(a | b) { return (a < b) ? T(a) : T(b); } template<typename T, typename T2> auto min(const T & a, const T2 & b) -> decltype(a | b) { return (a < b) ? T(a) : T(b); }
template<typename T, typename T2> auto max(const T & a, const T2 & b) -> decltype(a | b) { return (a < b) ? T(b) : T(a); } template<typename T, typename T2> auto max(const T & a, const T2 & b) -> decltype(a | b) { return (a < b) ? T(b) : T(a); }
/// To be sure that floating point numbers won't be casted to integers in ::abs()... /// To be sure that floating point numbers won't be casted to integers in ::abs()...
template<typename T> T sureAbs(const T & x) { return (x < T(0)) ? -x : x; } template<typename T> T sureAbs(const T & x) { return (x < T(0)) ? -x : x; }
/// Clamps the input so that it remains within the interval [a, b]
template<typename T>
T clamp(const T & x, const T & a, const T & b)
{
if(x < a)
return a;
if(x > b)
return b;
return x;
}
/// VERY simple uniform random numbers generator (Park Miller)
///
/// http://www.cems.uwe.ac.uk/~irjohnso/coursenotes/ufeen8-15-m/p1192-parkmiller.pdf
/// http://www0.cs.ucl.ac.uk/staff/ucacbbl/ftp/papers/langdon_2009_CIGPU.pdf
template<int x=1>
int intrnd(int & seed) // 1 <= seed < m
{
const int a = 16807; //ie 7**5
const int m = 2147483647; //ie 2**31-1
seed = (long(seed) * a) % m;
return seed;
}
/* /*
/// Generic operator<< for ostream, (to print std::vector, etd::list, std::map, etc). Can generate conflicts with specialized operator<< overloads. /// Generic operator<< for ostream, (to print std::vector, etd::list, std::map, etc). Can generate conflicts with specialized operator<< overloads.
@ -118,12 +147,15 @@ struct Chronometer
return double(resolution_ratio.num)/resolution_ratio.den; return double(resolution_ratio.num)/resolution_ratio.den;
} }
/// Measures the time elapsed between the creation of the object and its destruction, and prints the result in std::cout. /// Measures the time elapsed between the creation of the object and its destruction, and prints the result in std::cout. If displayname = "", the name stored in the object is used.
void MeasureTimeElapsed() const void MeasureTimeElapsed(const std::string & displayname = "") const
{ {
// measure time since object creation and print it in the console // measure time since object creation and print it in the console
const std::string *newname = &name;
if(displayname.size())
newname = &displayname;
std::cout.precision(16); std::cout.precision(16);
std::cout << name.c_str() << "\t: " << GetTime() << " s (+/- " << GetResolution() << " s)" << std::endl;// use of c_str() so that there is no ambiguity with the generic operator<< std::cout << newname->c_str() << "\t: " << GetTime() << " s (+/- " << GetResolution() << " s)" << std::endl;// use of c_str() so that there is no ambiguity with the generic operator<<
} }
}; };