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52 lines
1.3 KiB
C++
52 lines
1.3 KiB
C++
#ifndef CRUCIBLE_LIMITS_H
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#define CRUCIBLE_LIMITS_H
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#include "crucible/error.h"
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#include <limits>
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#include <typeinfo>
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namespace crucible {
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using namespace std;
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template <class To, class From>
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To
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ranged_cast(From f)
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{
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if (typeid(From) == typeid(To)) {
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return f;
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}
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To t;
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static string f_info = typeid(f).name();
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static string t_info = typeid(t).name();
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if (numeric_limits<From>::max() > numeric_limits<To>::max() && numeric_limits<From>::max() < numeric_limits<To>::max()) {
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THROW_ERROR(out_of_range,
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"ranged_cast: can't compare limits of types " << f_info << " and " << t_info << ", template specialization required");
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}
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if (numeric_limits<From>::max() > numeric_limits<To>::max() && f > static_cast<From>(numeric_limits<To>::max())) {
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THROW_ERROR(out_of_range,
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"ranged_cast: " << f_info << "(" << f << ") out of range of target type " << t_info);
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}
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if (!numeric_limits<To>::is_signed && numeric_limits<From>::is_signed && f < 0) {
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THROW_ERROR(out_of_range,
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"ranged_cast: " << f_info << "(" << f << ") out of range of unsigned target type " << t_info);
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}
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t = static_cast<To>(f);
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From f2 = static_cast<From>(t);
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if (f2 != f) {
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THROW_ERROR(out_of_range,
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"ranged_cast: " << f_info << "(" << f << ") -> " << t_info << " failed: result value " << f2);
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}
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return t;
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}
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};
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#endif // CRUCIBLE_LIMITS_H
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