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43 lines
1.4 KiB
ReStructuredText
43 lines
1.4 KiB
ReStructuredText
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variadic_args
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=============
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transparent argument to deal with multiple parameters to a function
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-------------------------------------------------------------------
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.. code-block:: cpp
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struct variadic_args;
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This class is meant to represent every single argument at its current index and beyond in a function list. It does not increment the argument count and is thus transparent. You can place it anyway in the argument list, and it will represent all of the objects in a function call that come after it, whether they are listed explicitly or not.
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.. code-block:: cpp
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:linenos:
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sol::state lua;
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// Function requires 2 arguments
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// rest can be variadic, but:
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// va will include everything after "a" argument,
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// which means "b" will be part of the varaidic_args list too
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// at position 0
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lua.set_function("v", [](sol::this_state, int a, sol::variadic_args va, int b) {
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int r = 0;
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for (auto v : va) {
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int value = v; // get argument out (implicit conversion)
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// can also do int v = va.get<int>(i); with index i
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r += value;
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}
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// Only have to add a, b was included
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return r + a;
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});
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lua.script("x = v(25, 25)");
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lua.script("x2 = v(25, 25, 100, 50, 250, 150)");
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lua.script("x3 = v(1, 2, 3, 4, 5, 6)");
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// will error: not enough arguments
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//lua.script("x4 = v(1)");
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lua.script("print(x)"); // 50
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lua.script("print(x2)"); // 600
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lua.script("print(x3)"); // 21
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