C++ max_size()

max_size() is a member function of C++ containers like std::set that returns the maximum number of elements the container can hold, based on the system or allocator limitations. It does not reflect the current size, but the theoretical upper bound.

Syntax

set_name.max_size()

Parameters:

This function does not take any parameters.

Return value:

Returns an integral value of type size_type (usually std::size_t) representing the maximum number of elements the set can theoretically contain, based on system or allocator limitations.

Example: Using max_size() with std::set

This code checks the maximum number of elements a std::set can theoretically hold, depending on system and allocator limits:

#include <iostream>
#include <set>

int main() {
  std::set<int> mySet;
  std::cout << "Maximum size of the set: " << mySet.max_size() << std::endl;
  return 0;
}

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The possible output of this code is:

Maximum size of the set: 4611686018427387903

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Note: The actual result may vary by system and compiler.

Codebyte Example: Using max_size() with std::set<std::string>

Here is a runnable codebyte example that demonstrates how to use max_size() with a std::set<std::string> to check its theoretical capacity:

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