update boost
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@@ -39,11 +39,21 @@ functions (for subcontracting).
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Virtual public functions (and therefore also public function overrides)
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declaring contracts using this library must specify an extra function parameter
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at the very end of the parameter list.
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at the very end of their parameter list.
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This parameter must be a pointer to this class and it must have default value
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@c 0 (i.e., @c nullptr).
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(This extra parameter is often named @c v in this documentation, but any name
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can be used.)
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@c 0 or @c nullptr (this extra parameter is often named @c v in this
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documentation, but any name can be used):
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@code
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class u {
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public:
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virtual void f(int x, boost::contract::virtual_* v = 0) { // Declare `v`.
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... // Contract declaration (which will use `v`) and function body.
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}
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...
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};
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@endcode
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In practice this extra parameter does not alter the calling interface of the
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enclosing function declaring the contract because it is always the very last
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