always use std:: namespace for math functions

fixes #201

1 files changed, 4 insertions, 4 deletions

diff --git a/src/map/tile.cpp b/src/map/tile.cpp
index 5e22dd0bb2..45fe88ee29 100644
--- a/src/map/tile.cpp
+++ b/src/map/tile.cpp
@@ -12,7 +12,7 @@ Tile::Tile(const ID& id)
 
 Tile::ID Tile::ID::parent(int8_t parent_z) const {
     assert(parent_z < z);
-    int32_t dim = pow(2, z - parent_z);
+    int32_t dim = std::pow(2, z - parent_z);
     return Tile::ID{
         parent_z,
         (x >= 0 ? x : x - dim + 1) / dim,
@@ -22,7 +22,7 @@ Tile::ID Tile::ID::parent(int8_t parent_z) const {
 
 std::forward_list<Tile::ID> Tile::ID::children(int32_t child_z) const {
     assert(child_z > z);
-    int32_t factor = pow(2, child_z - z);
+    int32_t factor = std::pow(2, child_z - z);
 
     std::forward_list<ID> children;
     for (int32_t ty = y * factor, y_max = (y + 1) * factor; ty < y_max; ++ty) {
@@ -34,7 +34,7 @@ std::forward_list<Tile::ID> Tile::ID::children(int32_t child_z) const {
 }
 
 Tile::ID Tile::ID::normalized() const {
-    int32_t dim = pow(2, z);
+    int32_t dim = std::pow(2, z);
     int32_t nx = x, ny = y;
     while (nx < 0) nx += dim;
     while (nx >= dim) nx -= dim;
@@ -45,7 +45,7 @@ bool Tile::ID::isChildOf(const Tile::ID &parent) const {
     if (parent.z >= z || parent.w != w) {
         return false;
     }
-    int32_t scale = pow(2, z - parent.z);
+    int32_t scale = std::pow(2, z - parent.z);
     return parent.x == ((x < 0 ? x - scale + 1 : x) / scale) &&
            parent.y == y / scale;
 }