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  1. #include <iostream>
  2. #include <map>
  3.  
  4.  
  5. int main() {
  6. 	std::map<std::string, int> cache {{"Hello", 42}};
  7.  
  8. 	auto p = cache.emplace("Hi", 0);
  9. 	auto& hi = p.first->second;
  10. 	if (p.second) {
  11. 		hi = 51; // Heavy computation.
  12. 	}
  13. 	std::cout << hi << std::endl;
  14. }
  15.  
Success #stdin #stdout 0s 3472KB
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Standard input is empty
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51
https://ideone.com/mBmWaE
language:
C++14 (gcc 8.3)
created:
9 years ago
visibility:
public

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