utilities.h

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#pragma once
 
#include <vector>
#include <cstddef>
 
void show_for_debug(bool val);
 
void show_for_debug(int val);
 
void show_for_debug(size_t val);
 
void show_for_debug(double val);
 
void show_for_debug(const std::vector<double>& val);
 
#ifdef NDEBUG
#define SHOW(varname) // nothing here
#else
#define SHOW(varname)                                                                    \
    std::cout << #varname << " = ";                                                      \
    show_for_debug(varname);
#endif