function

问题 I'm trying to pass a table as an argument in a PostgreSQL function, and I can't find the right keyword (what should be instead of table in my code) in the first line : CREATE FUNCTION test.fcttest(table) RETURNS SETOF test.out_table AS $$ INSERT INTO test.out_table /* obviously, the schema for this table is what it should be, an int column for A.id and a varchar(30) column for A.another_field */ SELECT A.id, A.another_field FROM $1 A; SELECT A.id, A.another_field FROM $1 A; $$ LANGUAGE SQL;

问题 I'm trying to pass a table as an argument in a PostgreSQL function, and I can't find the right keyword (what should be instead of table in my code) in the first line : CREATE FUNCTION test.fcttest(table) RETURNS SETOF test.out_table AS $$ INSERT INTO test.out_table /* obviously, the schema for this table is what it should be, an int column for A.id and a varchar(30) column for A.another_field */ SELECT A.id, A.another_field FROM $1 A; SELECT A.id, A.another_field FROM $1 A; $$ LANGUAGE SQL;

问题 I'm trying to pass a table as an argument in a PostgreSQL function, and I can't find the right keyword (what should be instead of table in my code) in the first line : CREATE FUNCTION test.fcttest(table) RETURNS SETOF test.out_table AS $$ INSERT INTO test.out_table /* obviously, the schema for this table is what it should be, an int column for A.id and a varchar(30) column for A.another_field */ SELECT A.id, A.another_field FROM $1 A; SELECT A.id, A.another_field FROM $1 A; $$ LANGUAGE SQL;

问题 When using the npm package " use-dark-mode " I try to apply the hook const darkMode = useDarkMode (false); inside a function but i get an error Error: Invalid hook call. Hooks can only be called inside of the body of a function component. This could happen for one of the following reasons: before giving you the code, I want to explain in more detail, I think you already understood from the package name, I want to use dark mode in my project, I have a lot of components, I pass the dark mode

问题 When using the npm package " use-dark-mode " I try to apply the hook const darkMode = useDarkMode (false); inside a function but i get an error Error: Invalid hook call. Hooks can only be called inside of the body of a function component. This could happen for one of the following reasons: before giving you the code, I want to explain in more detail, I think you already understood from the package name, I want to use dark mode in my project, I have a lot of components, I pass the dark mode

问题 I want to implement for a step function in numpy with the definition: 回答1: Since the other answer does not implement the function in the question, here is a correct soluton: import numpy as np import matplotlib.pyplot as plt x= np.linspace(0., 50., 1001) f = lambda x0, x1: np.piecewise(x, [x < x0, (x >= x0) & (x <= x1), x > x1], [0., lambda x: x/x0, 1.]) plt.plot(x, f(10, 30)) plt.show() 来源： https://stackoverflow.com/questions/57516274/step-function-with-linear-inteval-in-numpy

问题 I want to implement for a step function in numpy with the definition: 回答1: Since the other answer does not implement the function in the question, here is a correct soluton: import numpy as np import matplotlib.pyplot as plt x= np.linspace(0., 50., 1001) f = lambda x0, x1: np.piecewise(x, [x < x0, (x >= x0) & (x <= x1), x > x1], [0., lambda x: x/x0, 1.]) plt.plot(x, f(10, 30)) plt.show() 来源： https://stackoverflow.com/questions/57516274/step-function-with-linear-inteval-in-numpy

问题 Consider this simple check for whether a (global) function is defined: template <typename T> concept has_f = requires ( const T& t ) { Function( t ); }; // later use in MyClass<T>: if constexpr ( has_f<T> ) Function( value ); unfortunately this allows for implicit conversions . This is obviously a big risk for mess-ups. Question: How to check if Function( const T& t ) 'explicitly' exists? Something like if constexpr ( std::is_same_v<decltype( Function( t ) ), void> ) should be free of implict

问题 Consider this simple check for whether a (global) function is defined: template <typename T> concept has_f = requires ( const T& t ) { Function( t ); }; // later use in MyClass<T>: if constexpr ( has_f<T> ) Function( value ); unfortunately this allows for implicit conversions . This is obviously a big risk for mess-ups. Question: How to check if Function( const T& t ) 'explicitly' exists? Something like if constexpr ( std::is_same_v<decltype( Function( t ) ), void> ) should be free of implict

问题 I want to set a theme preference cookie for a link function. Here's how the HTML of the element looks like: <li class="menu-item theme-item"> <a href="javascript:void()" class="btn" aria-pressed="false">Theme Toggle</a> </li> And here's how the jQuery function for this element is set: $('.theme-item .btn').on('click', function(e) { e.preventDefault(); $(this).attr('aria-pressed', $(this).attr('aria-pressed') === 'false' ? 'true' : 'false'); $('html').attr('data-theme', $('html').attr('data