CppQuickStart/utils.hpp

#ifndef DEF_utils
#define DEF_utils

#include <ostream>
#include <utility>

#define PRINT_VAR(x) std::cout << #x << "\t= " << (x) << "\n"
#define PRINT_VEC(x);	{std::cout << #x << "\t= "; \
						for(unsigned int i_print_vec = 0 ; i_print_vec < (x).size() ; i_print_vec++) \
							std::cout << (x)[i_print_vec] << "\t"; \
						std::cout << "\n";}
#define PRINT_STR(x) std::cout << (x) << "\n"

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); }

/// 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, template<class,class...> class C, class... Args>
std::ostream& operator<<(std::ostream& os, const C<T,Args...>& objs)
{
    for (auto const& obj : objs)
        os << obj << ' ';
    return os;
}

/// Convenience template class to do StdPairValueCatcher(a, b) = someFunctionThatReturnsAnStdPair<A,B>()
/// Instead of doing a = std::get<0>(result_from_function), b = std::get<1>(result_from_function)
template<typename A, typename B>
struct StdPairValueCatcher
{
    A & a;
    B & b;
    StdPairValueCatcher(A & a_, B & b_) : a(a_), b(b_) {}
    std::pair<A, B> const& operator=(std::pair<A, B> const& p) {a = std::get<0>(p);  b = std::get<1>(p); return p; }
};

#endif