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34 lines
953 B
ReStructuredText
34 lines
953 B
ReStructuredText
protect
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=======
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Routine to mark a function / variable as requiring safety
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---------------------------------------------------------
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.. code-block:: cpp
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template <typename T>
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auto protect( T&& value );
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``protect( my_func )`` allows you to protect a function call or member variable call when it is being set to Lua. It can be used with usertypes or when just setting a function into Sol. Below is an example that demonstrates that a call that would normally not error without :doc:`Safety features turn on<../safety>` that instead errors and makes the Lua safety-call wrapper ``pcall`` fail:
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.. code-block:: cpp
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struct protect_me {
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int gen(int x) {
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return x;
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}
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};
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sol::state lua;
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lua.open_libraries(sol::lib::base);
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lua.new_usertype<protect_me>("protect_me",
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"gen", sol::protect( &protect_me::gen )
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);
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lua.script(R"__(
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pm = protect_me.new()
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value = pcall(pm.gen,pm)
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)__");
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);
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bool value = lua["value"];
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// value == false
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