Effective C++ Ed. 3rd: Item 29. Strive for exception-safe code

When an exception is thrown, a exception-safe fuction:

• Leak no resources
• do not make data structures corrupt.

Exception-safe functions should offer one of three guarantees:

• the basic guarantee
• the strong guarantee
• the nothrow guarantee

Results:

• Although the strong guarantee is not always practical, but where possible it can be offered via copy-and-swap."pimple idiom" may also be used here.
• As said, "A chain is only as strong as its weakest link". A function can usually offer a guarantee no stronger than the weakest guarantee of the functions it calls.

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