function-call

Why might a function not get called in initState(){ super.initState()} in flutter, but work perfectly fine if called later in the same page?

不打扰是莪最后的温柔 提交于 2021-02-15 07:37:12
问题 I have a function named splitVendorMainCategory, which simply splits a List into two subLists, described as: List vendorMainCategory = ['one', 'two', 'three', 'four']; Future splitVendorMainCategory() async { for (int i=0; i< (vendorMainCategoryLength); i+=2){ vendorMainCategoryC1.add(vendorMainCategory[i]), }, for(int j = 1; j < vendorMainCategoryLength; j+=2){ vendorMainCategoryC2.add(vendorMainCategory[j]), } } And I call it right at the initialisation of the page, but it returns two empty

Why might a function not get called in initState(){ super.initState()} in flutter, but work perfectly fine if called later in the same page?

痴心易碎 提交于 2021-02-15 07:37:08
问题 I have a function named splitVendorMainCategory, which simply splits a List into two subLists, described as: List vendorMainCategory = ['one', 'two', 'three', 'four']; Future splitVendorMainCategory() async { for (int i=0; i< (vendorMainCategoryLength); i+=2){ vendorMainCategoryC1.add(vendorMainCategory[i]), }, for(int j = 1; j < vendorMainCategoryLength; j+=2){ vendorMainCategoryC2.add(vendorMainCategory[j]), } } And I call it right at the initialisation of the page, but it returns two empty

Default argument and parameter promotions in C

女生的网名这么多〃 提交于 2021-02-08 14:25:04
问题 I was studying about default argument promotions and got stuck at one point. In C 2011 (ISO/IEC 9899:2011), the relevant part seem to be: §6.5.2.2 Function calls ¶6 If the expression that denotes the called function has a type that does not include a prototype, the integer promotions are performed on each argument, and arguments that have type float are promoted to double. These are called the default argument promotions. If the number of arguments does not equal the number of parameters, the

Default argument and parameter promotions in C

余生长醉 提交于 2021-02-08 14:24:54
问题 I was studying about default argument promotions and got stuck at one point. In C 2011 (ISO/IEC 9899:2011), the relevant part seem to be: §6.5.2.2 Function calls ¶6 If the expression that denotes the called function has a type that does not include a prototype, the integer promotions are performed on each argument, and arguments that have type float are promoted to double. These are called the default argument promotions. If the number of arguments does not equal the number of parameters, the

undefined variable in MATLAB

让人想犯罪 __ 提交于 2021-02-04 21:33:54
问题 I am newbie to MATLAB .I have written a code to upsample a data.when executed always shrows the particular error(below) ??? Input argument "n" is undefined. Error in ==> upsamp at 7 mm=min(n) but when i just write the foll. output [n1,y]=upsamp([1,2,3,4,5,6],-1:4,3) command window ,its shows me the correct upsampled data with its figure. then why the error is popping up? Or i just click on run button,and error is shown in command window. Please help me out to debug that error: My code is

How to pass a Type as an input variable to a inner function which is called in a function

。_饼干妹妹 提交于 2021-01-29 14:16:35
问题 Tried the following to pass the TYPE variable 'clientBdrIds 'as input parameter to an function'SP_GetDat' using unnest .Not working. Please help me by suggesting a way to pass the TYPE variable as input to a function which is called by the function 'Sp_GetFimBdrRiskData'. CREATE OR REPLACE FUNCTION Sp_GetFimBdrRiskData(clientBdrIds CL_Numeric[]) returns void AS $$ BEGIN create temporary table tt_RISKVALUES as SELECT * FROM SP_GetDat(**select * from unnest (clientBdrIds)**);//type variable as

When passing variable to function I get 'Invalid argument', but when I hard code it works in Apps Script

心不动则不痛 提交于 2020-12-23 08:21:11
问题 This is my test function: var testFolderId = 'di98kjsdf9...'; function testGetFolder(testFolderId){ folder = DriveApp.getFolderById(testFolderId); Logger.log("folders: " + folder); } It fails when I do this. The error says: INVALID ARGUMENT However, if I hardcode the id into the 'DriveApp.getFolderById' function, it works. Any explanation? This makes no sense to me. 回答1: When a function is called directly from the script editor/menu/button click/triggers, the following sequence of actions

How to execute a call instruction with a 64-bit absolute address?

旧城冷巷雨未停 提交于 2020-06-08 06:14:05
问题 I am trying to call a function - that should have an absolute address when compiled and linked - from machine code. I am creating a function pointer to the desired function and trying to pass that to the call instruction, but I noticed that the call instruction takes at most a 16 or 32-bit address. Is there a way to call an absolute 64-bit address? I am deploying for the x86-64 architecture and using NASM to generate the machine code. I could work with a 32-bit address if I could be

Evaluating a symbolic function

半世苍凉 提交于 2020-03-15 09:37:29
问题 I want to find cos(5) . Why is this expression invalid: syms x f=sin(x) disp(diff(f)(5)) The error is Line: 3 Column: 12 Indexing with parentheses '()' must appear as the last operation of a valid indexing expression. 回答1: Your error has nothing to do with symbolic variables. It is caused by the statement diff(f)(5) - which is not something MATLAB syntax allows (as of R2019b). MATLAB interprets this as the user trying to access the 5th element of some intermediate result. If you want to know

How Windows thread stack guard page mechanism works in case of uninitialized local variables?

生来就可爱ヽ(ⅴ<●) 提交于 2020-02-27 07:55:23
问题 On Windows OS for x86-32/x86-64 architecture thread stack virtual memory consist of "Reserved Part" "Commit Part", "Guard Page" and "Reserved Page". Question: Imagine that I have 1 page of commit memory, and 1MB of reserve memory for thread stack. I allocate on the stack some memory equal to K Pages without initialization. K is equal for example 10. It seems that in start of stack frame memory on the stack will be allocated by user space code like this: sub esp, K*4096 Guard Page mechanism