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      std::unique_ptr::release

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      std :: unique_ptr
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      <tbody> </tbody>
      pointer release();
      		 (desde C++11)
      Libera a propriedade do objeto gerenciado se houver. get() retornos nullptr após a chamada.
      Original:
      Releases the ownership of the managed object if any. get() returns nullptr after the call.
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      Parâmetros

      (Nenhum)
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      (none)
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      Valor de retorno

      Ponteiro para o objeto gerenciado ou nullptr se não houvesse objeto gerenciado, ou seja, o valor que seria devolvido por get() antes da chamada.
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      Pointer to the managed object or nullptr if there was no managed object, i.e. the value which would be returned by get() before the call.
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      Exceções

      noexcept specification:  
      <tbody> </tbody>
      noexcept
        (desde C++11)

      Exemplo

      #include <memory>
#include <iostream>

struct Foo {
    Foo() { std::cout << "Foo\n"; }
    ~Foo() { std::cout << "~Foo\n"; }
};

int main()
{
    std::cout << "Creating new Foo...\n";
    std::unique_ptr<Foo> up(new Foo());

    std::cout << "About to release Foo...\n";
    Foo* fp = up.release();

    if (up.get() == nullptr)
        std::cout << "Foo is no longer owned by unique_ptr...\n";

    delete fp;
}

      Saída: 

      Creating new Foo...
Foo
About to release Foo...
Foo is no longer owned by unique_ptr...
~Foo

      Veja também
      retorna um ponteiro para o objeto gerenciado
      Original:
      returns a pointer to the managed object
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      (função pública membro) [edit]
      substitui o objeto gerenciado
      Original:
      replaces the managed object
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      (função pública membro) [edit]