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Reserve storage when decoding

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Erica Fischer
2024-01-25 11:21:25 -08:00
parent a5eabab8bf
commit 697b9d6e11
1 changed files with 3 additions and 0 deletions
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mvt.cpp
+3
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@@ -224,6 +224,7 @@ bool mvt_tile::decode(const std::string &message, bool &was_compressed) {
case 2: /* tag */ case 2: /* tag */
{ {
auto pi = feature_reader.get_packed_uint32(); auto pi = feature_reader.get_packed_uint32();
feature.tags.reserve(std::distance(pi.first, pi.second));
for (auto it = pi.first; it != pi.second; ++it) { for (auto it = pi.first; it != pi.second; ++it) {
feature.tags.push_back(*it); feature.tags.push_back(*it);
} }
@@ -237,6 +238,7 @@ bool mvt_tile::decode(const std::string &message, bool &was_compressed) {
case 4: /* geometry */ case 4: /* geometry */
{ {
auto pi = feature_reader.get_packed_uint32(); auto pi = feature_reader.get_packed_uint32();
geoms.reserve(std::distance(pi.first, pi.second));
for (auto it = pi.first; it != pi.second; ++it) { for (auto it = pi.first; it != pi.second; ++it) {
geoms.push_back(*it); geoms.push_back(*it);
} }
@@ -250,6 +252,7 @@ bool mvt_tile::decode(const std::string &message, bool &was_compressed) {
} }
long long px = 0, py = 0; long long px = 0, py = 0;
feature.geometry.reserve(geoms.size()); // probably not quite right, but still plausible
for (size_t g = 0; g < geoms.size(); g++) { for (size_t g = 0; g < geoms.size(); g++) {
uint32_t geom = geoms[g]; uint32_t geom = geoms[g];
uint32_t op = geom & 7; uint32_t op = geom & 7;