PermMap.cc

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/*
 * LSST Data Management System
 * Copyright 2017 AURA/LSST.
 *
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 *
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#include <memory>
#include <algorithm>  // for std::max
#include <sstream>
#include <stdexcept>
 
#include "astshim/base.h"
#include "astshim/Mapping.h"
#include "astshim/PermMap.h"
 
namespace {

void checkConstant(int numConst, std::vector<int> const& perm, std::string const& name) {
    int maxConst = 0;
    for (int const& innum : perm) {
        maxConst = std::max(maxConst, -innum);
    }
    if (maxConst > numConst) {
        std::ostringstream os;
        os << name << " specifies max constant number (min negative number) " << maxConst << ", but only "
           << numConst << " constants are available";
        throw std::invalid_argument(os.str());
    }
}
 
}  // anonymous namespace
 
namespace ast {
 
AstPermMap* PermMap::makeRawMap(std::vector<int> const& inperm, std::vector<int> const& outperm,
                                std::vector<double> const& constant, std::string const& options) {
    if (inperm.empty()) {
        throw std::invalid_argument("inperm has no elements");
    }
    if (outperm.empty()) {
        throw std::invalid_argument("outperm has no elements");
    }
    // check `constant` (since AST does not)
    checkConstant(constant.size(), inperm, "inperm");
    checkConstant(constant.size(), outperm, "outperm");
 
    double const* constptr = constant.size() > 0 ? constant.data() : nullptr;
    auto result = astPermMap(inperm.size(), inperm.data(), outperm.size(), outperm.data(), constptr, "%s",
                             options.c_str());
    assertOK();
    return result;
}
 
}  // namespace ast