constants.hpp

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#ifndef OGLPLUS_TEXGEN_CONSTANTS_HPP
#define OGLPLUS_TEXGEN_CONSTANTS_HPP
 
#include "interface.hpp"
#include <string>
 
namespace eagine::oglp::texgen {
namespace expr {
struct constant_id {
    constant_intf& constant;
    compile_context& context;
};
std::ostream& operator<<(std::ostream& out, const constant_id&);
} // namespace expr
 
class base_constant : public constant_intf {
public:
    std::string identifier();
 
    slot_data_type value_type() override;
 
    virtual std::ostream& value(std::ostream&, compile_context&) = 0;
 
    std::ostream& definitions(std::ostream&, compile_context&) override;
 
    std::ostream& expression(std::ostream&, compile_context&) override;
};
 
class constant_pi : public base_constant {
public:
    string_view name() const noexcept override;
 
    std::ostream& value(std::ostream&, compile_context&) override;
};
 
class constant_phi : public base_constant {
public:
    string_view name() const noexcept override;
 
    std::ostream& value(std::ostream&, compile_context&) override;
};
 
} // namespace eagine::oglp::texgen
 
#if !OGLPLUS_LINK_LIBRARY || defined(OGLPLUS_IMPLEMENTING_LIBRARY)
#include <oglplus/texgen/constants.inl>
#endif
 
#endif // OGLPLUS_TEXGEN_CONSTANTS_HPP