51 lines
1.4 KiB
C++
51 lines
1.4 KiB
C++
#include <map>
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#include <string>
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#include <unordered_map>
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#include <vector>
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class MapUpdater {
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public:
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std::map<std::string, double> data;
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// 初始化：预建立迭代器缓存（只执行一次）
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void init(const std::vector<std::string> &ordered_keys) {
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// 先插入所有 key（确保存在）
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for (const auto &key : ordered_keys) {
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data[key] = 0.0;
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}
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// 预缓存迭代器
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iter_cache.reserve(ordered_keys.size());
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for (const auto &key : ordered_keys) {
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iter_cache[key] = data.find(key);
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}
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ordered_keys_ = ordered_keys;
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}
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// 高效更新（每 50ms 调用）：无需查找，直接写值
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void update(const std::string &key, double value) {
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auto it = iter_cache.find(key);
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if (it != iter_cache.end()) {
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it->second->second = value;
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}
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}
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// 按固定顺序刷新全部（批量模式）
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void refresh_all(const std::vector<double> &values) {
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for (size_t i = 0; i < ordered_keys_.size(); ++i) {
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iter_cache[ordered_keys_[i]]->second = values[i];
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}
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}
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// 按固定顺序遍历
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void for_each_ordered(std::function<void(const std::string &, double)> fn) {
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for (const auto &key : ordered_keys_) {
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fn(key, data[key]);
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}
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}
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private:
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std::vector<std::string> ordered_keys_;
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std::unordered_map<std::string, std::map<std::string, double>::iterator>
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iter_cache;
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}; |