[C++] Use emplace instead of insert+make_pair

3 files changed, 4 insertions, 4 deletions

diff --git a/dep.cc b/dep.cc
index 8da6156..434d9ad 100644
--- a/dep.cc
+++ b/dep.cc
@@ -349,7 +349,7 @@ class DepBuilder {
       rule->outputs.clear();
       rule->outputs.push_back(output);
 
-      auto p = rules_.insert(make_pair(output, rule));
+      auto p = rules_.emplace(output, rule);
       if (p.second) {
         if (!first_rule_ && output.get(0) != '.') {
           rule->is_default_target = true;
diff --git a/file_cache.cc b/file_cache.cc
index 6a05550..afdb3bd 100644
--- a/file_cache.cc
+++ b/file_cache.cc
@@ -44,7 +44,7 @@ class MakefileCacheManagerImpl : public MakefileCacheManager {
 
   virtual Makefile* ReadMakefile(const string& filename) override {
     Makefile* result = NULL;
-    auto p = cache_.insert(make_pair(filename, result));
+    auto p = cache_.emplace(filename, result);
     if (p.second) {
       p.first->second = result = new Makefile(filename);
     } else {
diff --git a/var.cc b/var.cc
index 9fac956..a5cde3e 100644
--- a/var.cc
+++ b/var.cc
@@ -125,7 +125,7 @@ Var* Vars::Lookup(Symbol name) const {
 }
 
 void Vars::Assign(Symbol name, Var* v) {
-  auto p = insert(make_pair(name, v));
+  auto p = emplace(name, v);
   if (!p.second) {
     Var* orig = p.first->second;
     if (orig->Origin() == VarOrigin::OVERRIDE ||
@@ -145,7 +145,7 @@ unordered_set<Symbol> Vars::used_env_vars_;
 
 ScopedVar::ScopedVar(Vars* vars, Symbol name, Var* var)
     : vars_(vars), orig_(NULL) {
-  auto p = vars->insert(make_pair(name, var));
+  auto p = vars->emplace(name, var);
   iter_ = p.first;
   if (!p.second) {
     orig_ = iter_->second;