Constify ConfigOptionVector::get_at.
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@ -33,7 +33,7 @@ class ConfigOptionVector
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virtual ~ConfigOptionVector() {};
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std::vector<T> values;
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T get_at(size_t i) {
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T get_at(size_t i) const {
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try {
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return this->values.at(i);
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} catch (const std::out_of_range& oor) {
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